Table of Contents
Understanding the Importance of Exercise for Diabetes Management
Living with diabetes and comorbidities presents unique challenges when it comes to physical activity, but exercise remains one of the most powerful tools for managing blood sugar levels and improving overall health outcomes. Exercise is a key part of managing diabetes and can help improve blood sugar levels, boost overall fitness, manage weight, lower the risk of heart disease and stroke, and improve well-being. For individuals managing multiple chronic conditions alongside diabetes, understanding how to exercise safely and effectively becomes even more critical.
Physical activity recommendations for people with type 2 diabetes are similar to those for a healthy population, with 150 minutes per week of aerobic exercise at a moderate-to-vigorous intensity. However, when comorbidities such as cardiovascular disease, hypertension, kidney disease, or neuropathy are present, exercise programs must be carefully tailored to individual needs and capabilities. The benefits of regular physical activity extend far beyond blood sugar control, offering improvements in cardiovascular health, bone density, mental health, and functional capacity.
Physical activity can lower blood glucose in the short term, reduce A1C when done regularly, and can lower blood glucose up to 24 hours or more after a workout by making the body more sensitive to insulin. This extended effect makes exercise a cornerstone of diabetes management, but it also requires careful monitoring and planning to prevent complications such as hypoglycemia or hyperglycemia during and after physical activity.
Consulting Healthcare Providers Before Starting an Exercise Program
Before embarking on any new exercise routine, individuals with diabetes and comorbidities must consult with their healthcare team. This step is not merely a formality but a critical component of safe exercise planning. Before starting a new fitness program, talk with your healthcare professional and ask if it’s OK to do the type of exercise you want to try, especially if you have type 1 diabetes.
Your healthcare team should include your primary care physician, endocrinologist, certified diabetes care and education specialist, and potentially a physical therapist or exercise physiologist. These professionals can provide personalized recommendations based on your specific health status, current medications, and existing complications. Treatment decisions should be timely, rely on evidence-based guidelines, address social determinants of health, and incorporate shared decision-making based on individual values, preferences, prognoses, comorbidities, and informed financial considerations, with approaches emphasizing person-centered team care and integrated long-term treatment approaches.
What to Discuss with Your Healthcare Team
During your consultation, several important topics should be addressed to ensure your exercise program is both safe and effective. Your healthcare professional can teach you how to balance your medicine with exercise and diet, including how the activities you want to do might affect your blood sugar, when is the best time of day for you to exercise, how the diabetes medicines you take might affect your blood sugar as you become more active, and depending on your treatment, your healthcare professional may tell you to adjust your medicine dose or the food you eat before exercise.
Your medical team will need to evaluate your current health status comprehensively. Healthcare providers should evaluate for diabetes complications, potential comorbid conditions, and overall health status, with ongoing management guided by the assessment of overall health and functional status, diabetes complications, cardiovascular risk, hypoglycemia risk, and shared decision making to set therapeutic goals. This evaluation may include cardiac stress testing, assessment of diabetic neuropathy, evaluation of retinopathy, and kidney function tests to determine what types and intensities of exercise are appropriate.
Pre-Exercise Medical Screening
For individuals with diabetes and cardiovascular comorbidities, pre-exercise cardiac screening may be necessary. This is particularly important for those who have been sedentary, are over 40 years of age, or have had diabetes for more than 10 years. The screening helps identify any underlying cardiovascular issues that could be exacerbated by physical activity and allows for appropriate exercise prescription.
Additionally, if you have diabetic retinopathy, certain high-impact or straining exercises may need to be avoided to prevent retinal hemorrhage or detachment. Those with peripheral neuropathy may require special footwear recommendations and should avoid exercises that could lead to foot injuries. Understanding these individual considerations is essential for creating a safe and sustainable exercise program.
Choosing Appropriate Exercise Activities for Your Condition
Selecting the right types of exercise is crucial for individuals with diabetes and comorbidities. The exercise program should be tailored to your fitness level, health conditions, personal preferences, and goals. A well-rounded program typically includes aerobic exercise, resistance training, flexibility work, and balance exercises.
Aerobic Exercise for Diabetes Management
For the best health benefits, adults should work up to at least 150 minutes a week of heart-pumping aerobic activity at moderate to vigorous intensity, with examples including fast walking or hiking, lap swimming, or a water aerobics class. Aerobic activities are particularly effective for improving cardiovascular health, enhancing insulin sensitivity, and promoting weight management.
Walking, cycling, jogging, swimming, or dancing are great aerobic exercises to get your heart rate up, lower blood sugar, improve insulin sensitivity, and boost cardiovascular health, and you should do any of these exercises for at least 30 minutes five times a week at a moderate intensity, meaning your heart rate should increase but you should still be able to talk comfortably. For those new to exercise or with significant comorbidities, starting with low-impact activities like walking or water aerobics can provide substantial benefits while minimizing injury risk.
Swimming and water aerobics are particularly beneficial for individuals with joint problems, obesity, or peripheral neuropathy, as the buoyancy of water reduces stress on joints and feet while still providing an excellent cardiovascular workout. Cycling, whether stationary or outdoor, offers another low-impact option that can be easily adjusted for intensity and is suitable for those with weight-bearing limitations.
Resistance and Strength Training
Resistance training is increasingly recognized as an essential component of diabetes management. The 2025 Standards of Care emphasizes the importance of meeting resistance training guidelines for those treated with weight management pharmacotherapy or metabolic surgery. Strength or resistance training can help build muscles while improving insulin sensitivity, as the more muscle mass you have, the better your body can utilize glucose, preventing blood sugar spikes, and you should aim to include weightlifting, resistance band exercises, and bodyweight exercises like squats, push-ups, or lunges in your weekly routine, doing these exercises twice a week targeting major muscle groups, with each session lasting 20 to 40 minutes.
Health care professionals should advocate moderate physical activity to enhance muscle health, gait coordination, and balance as part of fracture preventive strategies, and aerobic and weight-bearing exercise should be recommended to counteract the potential negative effect of weight loss on bone. This is particularly important for older adults with diabetes who face increased fracture risk due to factors such as sarcopenia and impaired gait.
When beginning resistance training, start with lighter weights or resistance bands and focus on proper form. Gradually increase the resistance as strength improves. For those with cardiovascular concerns, circuit training with lighter weights and higher repetitions may be preferable to heavy lifting, which can cause significant blood pressure spikes.
Flexibility and Balance Training
Older people suffering from diabetes are usually prone to joint stiffness and injuries, and for such people, it’s advisable to engage in flexibility and balance exercises, as Pilates, stretching activities, or yoga exercises for diabetes will help enhance coordination and muscle control, which is crucial for avoiding falls or accidents. Balance training becomes increasingly important as diabetes duration increases, particularly for those with peripheral neuropathy who may have reduced sensation in their feet.
Yoga and tai chi offer dual benefits of improving flexibility and balance while also providing stress reduction and mindfulness benefits. These practices can be adapted to various fitness levels and physical limitations, making them accessible options for many individuals with diabetes and comorbidities. Regular stretching exercises help maintain joint range of motion, reduce muscle tension, and can improve overall functional capacity for daily activities.
Understanding How Different Exercise Types Affect Blood Sugar
Different types of exercise affect blood glucose levels in distinct ways. Most of the time, working out causes blood glucose to dip, but some people, after certain types of exercise, notice that their glucose levels actually rise during or after exercise, as using muscles helps burn glucose and improves the way insulin works, which is why blood glucose levels usually come down during exercise, but you might see blood glucose go up after exercise too.
Some workouts, such as heavy weightlifting, sprints, and competitive sports, cause you to produce stress hormones such as adrenaline, and adrenaline raises blood glucose levels by stimulating your liver to release glucose. More intense workouts can raise your hormone levels, such as adrenaline, which can cause increased blood sugar, with activities that are likely to cause this spike being weightlifting and high intensity interval training (HIIT), while most aerobic or cardiovascular activities can lower your glucose.
Understanding these patterns is essential for managing blood glucose effectively during exercise. Anaerobic exercise may raise blood glucose, while aerobic exercise is more likely to have an immediate effect on lowering blood glucose. By tracking your blood glucose responses to different activities, you can learn to anticipate and manage these fluctuations appropriately.
Blood Sugar Monitoring: Before, During, and After Exercise
Proper blood glucose monitoring is perhaps the most critical safety measure for individuals with diabetes who exercise. To lower the chances of health problems, check your blood sugar before, during and after exercise, as some people with diabetes need to track their blood sugar before, during and after physical activity to show how the body responds to exercise and help prevent blood sugar swings that could be dangerous.
Pre-Exercise Blood Glucose Monitoring
If you take insulin or other medicines that can cause low blood sugar, test your blood sugar 15 to 30 minutes before exercising. This pre-exercise check is crucial for determining whether it’s safe to begin your workout and whether any adjustments to food intake or medication are needed.
If your blood sugar is below 100 mg/dL, you should eat a small carbohydrate snack like a piece of fruit or a granola bar to avoid hypoglycemia during exercise, and if your blood sugar is above 250 mg/dL, test for ketones, especially for Type 1 diabetics. General guidelines before exercise include: if blood sugar is lower than 100 mg/dL, eat a snack containing 15 to 30 grams of carbohydrates such as fruit, crackers, or glucose tablets before your workout; 100 to 250 mg/dL is the safe pre-workout blood sugar range for most people; and 250 mg/dL or higher is a dangerous zone that needs to be lowered to exercise safely.
Before you begin your workout, it’s important to check your blood glucose, with a typical, healthy exercise range being 140 mg/dL to 160 mg/dL, and if your level is too high — 300 or more — postpone exercise until your blood sugar is back in a healthy range. Exercising with very high blood glucose, especially in the presence of ketones, can be dangerous and may lead to diabetic ketoacidosis in individuals with type 1 diabetes.
Monitoring During Exercise
For longer or more intense exercise sessions, monitoring blood glucose during the activity is essential. If you’re planning a workout that lasts longer than 30 minutes or involves high-intensity activity, it’s recommended to check your blood sugar ranges every 15 to 30 minutes. Monitor your blood glucose every 30 minutes to 1 hour during activity.
Continuous glucose monitors (CGMs) have revolutionized exercise management for people with diabetes. Using your CGM can help you monitor your glucose before, during, and after workouts to help stay in a safe range or adjust as needed. CGMs provide real-time glucose readings and trend arrows that show whether glucose is rising, falling, or stable, allowing for proactive management rather than reactive treatment.
If you use a continuous glucose monitor to track your blood sugar, talk with your healthcare professional, as you may be told to test your blood sugar with a finger stick before, during or after exercise, and if you receive insulin through an automated insulin delivery system, talk with your healthcare professional about how to keep your blood sugar in a healthy range for exercise. Some automated insulin delivery systems have exercise modes that can help prevent hypoglycemia during physical activity.
Post-Exercise Glucose Monitoring
Blood glucose monitoring doesn’t end when your workout does. Physical activity continues to affect the body even after you stop moving, and for people with diabetes, this means staying alert to post-exercise blood sugar drops, so it’s important to check your blood sugar ranges immediately after exercise and then monitor them regularly over the next 4 to 8 hours, because your muscles, which store glucose during exercise, continue using sugar from the bloodstream as they recover and repair, and this process can cause a delayed drop in blood glucose levels, especially after intense or prolonged workouts.
Check blood glucose every 1-2 hours post-exercise, as there are two peaks of increased glucose requirements after exercise: approximately 60-90 minutes post-exercise when glycogen stores are being replenished and there is increased insulin sensitivity, and additionally, there may be a change in metabolic rate and reduction in insulin requirements for up to 24 hours. This extended period of increased insulin sensitivity means that hypoglycemia risk remains elevated long after exercise completion.
Some people develop low blood glucose 4 to 8 hours after their exercise has ended. This delayed hypoglycemia is particularly common after prolonged or intense exercise and can occur during sleep if evening exercise is performed. Checking blood glucose before bed and potentially setting an alarm for a middle-of-the-night check may be necessary after particularly strenuous workouts.
Preventing and Managing Hypoglycemia During Exercise
Hypoglycemia, or low blood sugar, is one of the most significant risks associated with exercise for people with diabetes, particularly those taking insulin or certain oral medications. Exercise can cause blood sugar to become too low in people who take insulin, a condition called hypoglycemia, and the risk also applies to people with type 2 diabetes who take insulin or other medicines linked with lower blood sugar. Understanding how to prevent and treat hypoglycemia is essential for safe exercise.
Risk Factors for Exercise-Induced Hypoglycemia
If you manage your diabetes with diet and lifestyle changes alone, you are less likely to develop hypoglycemia, but if you take insulin or a secretagogue like sulfonylurea to manage your diabetes, you may need to adjust your insulin dose or carbohydrate intake to prevent hypoglycemia, and keep in mind that hypoglycemia is more likely to happen if you carry some carbohydrates with you when you exercise.
Several factors influence hypoglycemia risk during exercise. How fit you are affects risk, as less fit individuals may see blood glucose drop quickly, the type of exercise matters since anaerobic exercise may raise blood glucose while aerobic is more likely to have an immediate effect on lowering blood glucose, insulin on board (IOB) is important as the more insulin on board the more likely you are to go low, and not enough insulin on board may result in high blood glucose.
Environmental factors also play a role. Temperature and humidity affect blood glucose, as in hot conditions blood vessels can dilate and blood glucose may drop, hydration status matters because when dehydrated your blood glucose may rise, and time of day affects insulin sensitivity, with less sensitivity early in the day and more sensitivity in the afternoon and evening, which may increase your risk of hypoglycemia.
Preventing Hypoglycemia
Prevention strategies should be individualized based on medication regimen, exercise type and duration, and personal glucose response patterns. Your provider may suggest eating a small snack before you exercise or they may make an adjustment to your medication(s), and for people engaging in long duration exercise, a combination of these two regimen changes may be necessary to prevent hypoglycemia during and after exercise.
For those using insulin pumps, temporary basal rate reductions can be highly effective. Reduce your basal rate following exercise for 1-2 hours, and if using a pump, set a temporary basal rate to reduce overnight basal rates. The timing and magnitude of basal rate reductions should be determined in consultation with your diabetes care team and refined based on your individual glucose response patterns.
Hypoglycemia unawareness is a condition where you usually don’t notice symptoms when your blood sugar is low, and you should not exercise if you’ve needed help with recovering from serious low blood sugar in the past 24 hours. Individuals with hypoglycemia unawareness require extra caution and may need to check blood glucose more frequently during and after exercise.
Treating Hypoglycemia: The 15-15 Rule
Despite best prevention efforts, hypoglycemia can still occur during or after exercise. Knowing how to treat it quickly and effectively is crucial. The American Diabetes Association recommends people who feel their blood glucose has gotten too low follow the 15-15 rule: check your blood glucose, and if your reading is 100 mg/dL or lower, eat 15-20 grams of carbohydrates to raise your blood glucose (options include 4 glucose tablets, 1 gel tube, juice, regular soda, sugar, or honey), check your blood glucose after 15 minutes, eat another 15 grams of carbs if your number is still below 100 mg/dL, repeat these steps every 15 minutes until your blood glucose is at least 100 mg/dL, and make sure your blood glucose is high enough before continuing your workout.
If you notice symptoms of low blood sugar, immediately stop exercising and check your blood sugar, and if your blood sugar level is 70 mg/dL or lower, consume a fast-acting carbohydrate like glucose tablets, juice, or candy, and recheck your blood sugar 15 minutes later, and if it’s still low, consume another 15-gram carbohydrate serving and then test again after 15 minutes, repeating the process until your blood sugar stabilises and is more than 100 mg/dl.
The key to effective hypoglycemia treatment is using fast-acting carbohydrates that will raise blood glucose quickly. Exercise can cause blood sugar to drop too low, so it’s a good idea to have snacks or drinks with simple sugars close by during workouts, choose snacks you can quickly consume when needed, and simple carbohydrates in things like fruit juice, sports drinks, candy, and glucose tablets are more quickly digested and absorbed into the bloodstream. Avoid treating lows with foods that contain fat or protein, as these slow glucose absorption and delay recovery.
Essential Safety Measures for Exercising with Diabetes
Beyond blood glucose monitoring, several other safety measures are essential for individuals with diabetes and comorbidities who exercise. These precautions help prevent complications and ensure that physical activity remains a positive component of diabetes management.
Carrying Emergency Supplies
Always carry quick-acting carbohydrates when exercising. Consider snacks that are easy to carry, and if you’re going on a run and not carrying a bag, fruit snacks are a good source of simple carbs you can keep in your pocket. The amount and type of carbohydrates to carry should be based on exercise duration and intensity. For shorter workouts, glucose tablets or gel packets may suffice. For longer endurance activities, you may need both fast-acting carbohydrates for treating lows and slower-digesting snacks for sustained energy.
In addition to carbohydrates, carry identification indicating you have diabetes. Medical ID bracelets or tags are particularly important, as they alert first responders to your condition in case of emergency. Include information about your medications, particularly if you use insulin, as this information is crucial for appropriate emergency treatment.
Keep your blood glucose meter or CGM receiver accessible during exercise. Keep your meter accessible. For outdoor activities, consider the impact of temperature on meter accuracy and insulin storage. Extreme heat or cold can affect both meter readings and insulin potency.
Proper Footwear and Foot Care
Foot care is critically important for individuals with diabetes, particularly those with peripheral neuropathy or peripheral vascular disease. Wearing appropriate footwear helps prevent injuries that could lead to serious complications. Choose athletic shoes that fit properly, provide adequate cushioning and support, and are appropriate for your chosen activity. Shoes should be broken in gradually to prevent blisters.
Inspect your feet daily, especially after exercise, looking for any cuts, blisters, redness, or areas of irritation. Those with neuropathy may not feel minor injuries, making visual inspection essential. Wear moisture-wicking socks to keep feet dry and reduce friction. Avoid exercising barefoot, even in water activities, to protect against cuts and abrasions.
For individuals with significant neuropathy or previous foot ulcers, certain activities may need to be avoided or modified. High-impact activities like running may need to be replaced with lower-impact alternatives like swimming or cycling. Consult with a podiatrist familiar with diabetes for specific footwear recommendations and activity modifications.
Hydration Strategies
Proper hydration is essential for everyone who exercises, but it takes on added importance for individuals with diabetes. Dehydration can affect blood glucose levels and increase the risk of complications. The 2025 Standards of Care emphasizes water intake over nutritive and nonnutritive sweetened beverages.
Drink water before, during, and after exercise. For most moderate-intensity workouts lasting less than an hour, water is sufficient. For longer or more intense sessions, you may need to replace electrolytes as well as fluids. However, be cautious with sports drinks, as many contain significant amounts of carbohydrates that can affect blood glucose levels. If using sports drinks, factor the carbohydrate content into your overall diabetes management plan.
Monitor urine color as a simple hydration indicator—pale yellow indicates good hydration, while dark yellow suggests you need more fluids. Be aware that certain diabetes medications, particularly SGLT2 inhibitors, increase urination and may require increased fluid intake during exercise.
Environmental Considerations
Exercise in safe environments and avoid extreme weather conditions when possible. Extreme heat can increase hypoglycemia risk and affect insulin absorption and action. In hot weather, exercise during cooler parts of the day (early morning or evening), wear light-colored, breathable clothing, and increase fluid intake. Be aware that heat can also affect blood glucose meter accuracy and insulin storage.
Cold weather presents different challenges. Low temperatures can affect meter accuracy and make hypoglycemia symptoms less noticeable. Dress in layers that can be removed as you warm up, protect extremities with gloves and warm socks, and be aware that shivering increases energy expenditure and can lower blood glucose.
Air quality is another important consideration. Poor air quality can exacerbate respiratory conditions and increase cardiovascular stress. Check air quality indexes before outdoor exercise, and consider indoor alternatives when pollution levels are high. This is particularly important for individuals with diabetes and cardiovascular or respiratory comorbidities.
Exercise with a Partner
Exercise with a friend or in a group if you are new to exercising. Having an exercise partner provides both safety and motivation. Your partner should be aware that you have diabetes and know how to recognize and respond to hypoglycemia. Teach them where you keep your glucose tablets or other fast-acting carbohydrates and when to call for emergency help.
Group exercise classes can provide structure, social support, and professional supervision. Many fitness facilities offer classes specifically designed for individuals with chronic conditions. These classes typically feature modifications for different fitness levels and health concerns, making them ideal for those with diabetes and comorbidities.
Managing Exercise with Specific Comorbidities
Diabetes rarely exists in isolation, and many individuals manage multiple chronic conditions simultaneously. Each comorbidity brings unique considerations for exercise planning and safety.
Cardiovascular Disease and Hypertension
Cardiovascular disease is a common comorbidity in diabetes. Lifestyle interventions, including patient-centered nutritional plans and exercise regimens, are effective for preventing and delaying the development of type 2 diabetes and for managing cardiometabolic risk factors including hypertension, hyperlipidemia, and inflammation. However, exercise must be approached cautiously when cardiovascular disease is present.
Individuals with known cardiovascular disease or multiple risk factors may require cardiac stress testing before beginning an exercise program. This testing helps identify safe exercise intensity levels and detect any exercise-induced cardiac abnormalities. Based on test results, your healthcare provider can prescribe specific heart rate ranges or perceived exertion levels for safe exercise.
For those with hypertension, regular aerobic exercise can help lower blood pressure over time. However, avoid exercises that cause extreme blood pressure spikes, such as heavy weightlifting with breath-holding (Valsalva maneuver). Focus on moderate-intensity aerobic activities and resistance training with lighter weights and higher repetitions. Monitor blood pressure regularly and report any unusual readings to your healthcare provider.
For individuals with type 2 diabetes, obesity, and symptomatic heart failure with preserved ejection fraction, treatment with a GLP-1 RA with demonstrated benefit in this population can reduce heart failure–related symptoms, reduce physical limitations, and improve exercise function. This highlights the importance of comprehensive medical management alongside exercise interventions.
Chronic Kidney Disease
Chronic kidney disease (CKD) is another common diabetes comorbidity that affects exercise capacity and safety. Individuals with CKD often experience fatigue, anemia, and reduced exercise tolerance. However, regular physical activity can help slow CKD progression and improve quality of life.
Exercise recommendations for those with CKD should be individualized based on disease stage and symptoms. Generally, moderate-intensity aerobic exercise is safe and beneficial. Start slowly and gradually increase duration and intensity as tolerated. Monitor for excessive fatigue, shortness of breath, or unusual symptoms during exercise.
Those on dialysis face additional considerations. Exercise is generally safe on non-dialysis days, but fatigue may be significant on dialysis days. Some individuals benefit from light exercise during dialysis sessions. Fluid restrictions common in advanced CKD require careful attention to hydration during exercise—work with your healthcare team to determine appropriate fluid intake.
Diabetic Neuropathy
Diabetic neuropathy, particularly peripheral neuropathy affecting the feet and legs, significantly impacts exercise choices and safety. Reduced sensation in the feet increases injury risk and makes certain activities inappropriate. Avoid high-impact activities that stress the feet, such as running, jumping, or step aerobics. Instead, choose low-impact alternatives like swimming, cycling, chair exercises, or upper body workouts.
Autonomic neuropathy affects heart rate response, blood pressure regulation, and temperature control. These individuals may not experience typical heart rate increases with exercise and may have difficulty regulating body temperature. Use perceived exertion rather than heart rate to gauge exercise intensity. Be especially cautious in extreme temperatures, as impaired temperature regulation increases heat illness and hypothermia risk.
Balance exercises become particularly important for those with neuropathy, as reduced proprioception increases fall risk. Incorporate balance training into your routine, starting with simple exercises like standing on one foot while holding onto a stable surface, and progressing to more challenging activities as balance improves.
Diabetic Retinopathy
Diabetic retinopathy requires specific exercise modifications to prevent retinal hemorrhage or detachment. The severity of retinopathy determines which activities are safe. Those with mild to moderate nonproliferative retinopathy can generally participate in most activities, though very high-intensity exercise may need to be avoided.
Proliferative diabetic retinopathy or severe nonproliferative retinopathy requires more significant restrictions. Avoid activities that involve jarring, straining, or rapid head movements. This includes contact sports, heavy weightlifting, high-impact aerobics, and activities with rapid position changes. Swimming, walking, stationary cycling, and light resistance training are generally safe alternatives.
After retinal surgery or laser treatment, follow your ophthalmologist’s specific recommendations regarding when and how to resume exercise. Some restrictions may be temporary, while others may be permanent depending on the extent of retinal damage.
Obesity
Obesity commonly coexists with type 2 diabetes and brings additional exercise considerations. Excess weight increases stress on joints, particularly knees, hips, and ankles, making weight-bearing activities more challenging and potentially painful. Low-impact activities like swimming, water aerobics, cycling, and chair exercises allow for cardiovascular conditioning without excessive joint stress.
Start with short exercise sessions and gradually increase duration as fitness improves. Even 10-minute bouts of activity provide health benefits and can be more manageable than longer sessions for those just beginning an exercise program. Focus on consistency rather than intensity initially, building an exercise habit before worrying about workout intensity.
Resistance training is particularly beneficial for individuals with obesity and diabetes, as increased muscle mass improves insulin sensitivity and metabolic rate. Use resistance bands, light weights, or bodyweight exercises to build strength without excessive joint stress. As fitness improves and weight decreases, exercise capacity typically increases, allowing for progression to more challenging activities.
Osteoporosis and Bone Health
Individuals with diabetes face increased fracture risk due to multiple factors. Maintaining glucose control and minimizing hypoglycemic episodes are crucial for bone health in people with diabetes, and individuals with prolonged disease, microvascular and macrovascular complications, or frequent hypoglycemic episodes face higher fracture risks and fall risks due to factors like sarcopenia and impaired gait.
Healthcare providers should assess fracture risk in older adults with diabetes as a part of routine care in diabetes clinical practice, according to risk factors and comorbidities, and monitor bone mineral density using dual-energy X-ray absorptiometry in older adults with diabetes (aged ≥65 years) and younger individuals with diabetes and multiple risk factors every 2–3 years.
All people with diabetes should receive an adequate daily intake of proteins, calcium, and vitamin D, stop smoking, and have regular physical activity. Weight-bearing and resistance exercises are particularly important for bone health, as they stimulate bone formation and help maintain bone density. Activities like walking, dancing, stair climbing, and resistance training should be incorporated into exercise routines when safe to do so.
Consider the potential adverse impact on skeletal health when selecting pharmacological options to lower glucose levels in people with diabetes, avoiding medications with a known association with higher fracture risk (e.g., thiazolidinediones and sulfonylureas) particularly for those at elevated risk for fractures, and to reduce the risk of falls and fractures, glycemic management goals should be individualized for people with diabetes at a higher risk of fracture.
Medication Adjustments for Exercise
Many individuals with diabetes require medication adjustments to exercise safely. The specific adjustments needed depend on the medications used, exercise type and duration, and individual glucose response patterns. Never adjust medications without consulting your healthcare provider first, but understanding general principles can facilitate productive discussions with your diabetes care team.
Insulin Adjustments
Insulin users often need to reduce insulin doses before, during, or after exercise to prevent hypoglycemia. The timing and magnitude of reductions depend on insulin type, injection timing relative to exercise, and individual sensitivity. Rapid-acting insulin taken before meals may need to be reduced if exercise will occur within 2-3 hours of eating. Long-acting basal insulin may need adjustment for individuals who exercise regularly at the same time each day.
Insulin pump users have more flexibility in making adjustments. Eat a carbohydrate snack or drink following exercise (trial 15-30 grams but this may need to be adjusted), reduce your basal rate following exercise for 1-2 hours, and review specific recommendations with your diabetes team prior to adjusting carbohydrate intake and insulin dosing. Temporary basal rate reductions can be set before, during, and after exercise. Many pumps have preset exercise modes that automatically reduce basal rates.
The site of insulin injection can affect absorption during exercise. Insulin injected into areas that will be heavily used during exercise (such as the thigh before running) may be absorbed more quickly, increasing hypoglycemia risk. Consider injecting into the abdomen for more consistent absorption, regardless of exercise type.
Oral Medications and Other Injectable Therapies
Not all diabetes medications increase hypoglycemia risk during exercise. Metformin, SGLT2 inhibitors, DPP-4 inhibitors, and GLP-1 receptor agonists generally do not cause hypoglycemia when used alone. However, sulfonylureas and meglitinides stimulate insulin secretion and can cause exercise-induced hypoglycemia. If you take these medications, discuss with your healthcare provider whether dose adjustments or timing changes are needed around exercise.
SGLT2 inhibitors increase urination and can contribute to dehydration during exercise. Ensure adequate fluid intake when exercising while taking these medications. Be aware of symptoms of dehydration and monitor for signs of diabetic ketoacidosis, a rare but serious complication that can occur with SGLT2 inhibitors, particularly during illness or prolonged strenuous exercise.
GLP-1 receptor agonists can cause nausea, which may be exacerbated by exercise, particularly when first starting these medications. If nausea is problematic, consider exercising before medication injection or at times when nausea is typically minimal. These medications also slow gastric emptying, which can affect the timing of carbohydrate absorption for treating hypoglycemia.
Nutrition Strategies for Exercise
Proper nutrition before, during, and after exercise is essential for maintaining blood glucose levels, supporting performance, and promoting recovery. Nutrition strategies should be individualized based on exercise type, duration, intensity, and medication regimen.
Pre-Exercise Nutrition
Pre-exercise nutrition depends on current blood glucose levels and the timing of your last meal. If exercising 1-2 hours after a meal and blood glucose is in target range, additional carbohydrates may not be needed. However, if blood glucose is below 100 mg/dL or it has been several hours since eating, a small carbohydrate-containing snack can help prevent hypoglycemia during exercise.
The composition of pre-exercise snacks matters. For exercise beginning within 30-60 minutes, choose easily digestible carbohydrates with minimal fat and protein, such as fruit, crackers, or juice. For exercise beginning in 1-2 hours, snacks can include some protein and fat for sustained energy, such as yogurt with fruit, peanut butter on whole grain bread, or cheese and crackers.
Avoid exercising immediately after large meals, as digestion diverts blood flow to the digestive system and can cause discomfort during activity. If you must exercise soon after eating, choose low-intensity activities and allow at least 30-60 minutes for initial digestion.
During-Exercise Nutrition
For exercise lasting less than 60 minutes at moderate intensity, additional carbohydrates during exercise are typically not needed unless blood glucose is trending low. For longer duration or higher intensity exercise, consuming 15-30 grams of carbohydrates every 30-60 minutes can help maintain blood glucose levels and support performance.
Sports drinks, gels, and chews designed for endurance athletes can be useful for maintaining blood glucose during prolonged exercise. However, be aware of the carbohydrate content and factor it into your overall diabetes management. Some individuals find that these products raise blood glucose too quickly, while others appreciate the rapid absorption for preventing lows.
Post-Exercise Nutrition
Post-exercise hypoglycemia is a common concern for people with diabetes who engage in moderate to vigorous exercise, and to prevent this, experts recommend eating a snack with slow-digesting (low-glycemic index) carbohydrates shortly after working out. Eat a carbohydrate snack or drink following exercise (trial 15-30 grams but this may need to be adjusted), and to recover glycogen stores eat a balance of complex carbohydrates, protein and fat.
Post-exercise meals and snacks serve multiple purposes: they help prevent delayed hypoglycemia, replenish glycogen stores, and support muscle recovery and adaptation. Include both carbohydrates and protein in post-exercise nutrition. Good options include a turkey sandwich, Greek yogurt with fruit and granola, or a smoothie made with fruit, milk, and protein powder.
The timing of post-exercise nutrition matters. Consuming carbohydrates and protein within 30-60 minutes after exercise optimizes glycogen replenishment and muscle recovery. However, for diabetes management, preventing hypoglycemia takes priority over optimizing athletic performance, so eat when needed to maintain safe blood glucose levels.
Creating a Sustainable Exercise Routine
Knowledge about safe exercise practices is valuable only if you actually exercise regularly. Creating a sustainable routine that fits your lifestyle, preferences, and capabilities is essential for long-term success.
Start Slowly and Progress Gradually
If you’re new to exercise or returning after a long break, start slowly. Begin with just 5-10 minutes of activity and gradually increase duration as fitness improves. The ADA recommends 150 minutes of moderate exercise — ideally broken into 30-minute workouts five days a week — or 75 minutes of rigorous exercise weekly, and also recommends avoiding more than two days in a row with no structured physical activity. However, reaching these goals may take weeks or months for those starting from a sedentary baseline.
Progress gradually in both duration and intensity. Once you can comfortably complete your target duration at a given intensity, you can slowly increase either the duration or intensity, but not both simultaneously. This gradual progression reduces injury risk and allows your body to adapt to increasing demands.
Choose Activities You Enjoy
The best exercise is the one you’ll actually do consistently. Choose activities you enjoy or at least don’t dread. If you hate running, don’t force yourself to run—try swimming, cycling, dancing, or any other activity that appeals to you. Variety can also help maintain interest and work different muscle groups.
Consider your personality and preferences when planning exercise. Some people thrive in group classes, while others prefer solo workouts. Some enjoy outdoor activities, while others prefer the controlled environment of a gym. Honor your preferences rather than forcing yourself into an exercise mold that doesn’t fit.
Schedule Exercise Like Any Other Important Appointment
Treat exercise as a non-negotiable appointment with yourself. Schedule it in your calendar and protect that time from other commitments. Many people find that exercising at the same time each day helps establish a routine and makes it easier to maintain consistency.
Morning exercise works well for many people with diabetes, as it starts the day with improved insulin sensitivity and doesn’t interfere with evening activities. However, consider moving your workout to later in the day if you usually exercise in the early mornings, as the dawn phenomenon, a natural rise in blood glucose that occurs between about 4:00 and 8:00 a.m., can result in higher levels during morning exercise, and the same workout done later in the day is less likely to result in a rise.
Track Your Progress
Managing glucose levels with any form of exercise is possible once you understand your personal patterns (doing regular blood glucose checks and keeping a workout log can help) and making adjustments that make sense to you and your lifestyle. Keep a log of your workouts, including the type of activity, duration, intensity, blood glucose levels before and after exercise, any symptoms experienced, and carbohydrates consumed.
Over time, patterns will emerge that help you predict how different activities affect your blood glucose. You may notice that morning workouts require different management strategies than evening workouts, or that certain activities consistently cause blood glucose to rise while others cause it to fall. Use this information to refine your exercise and diabetes management strategies.
Tracking also provides motivation by showing your progress over time. Celebrate improvements in fitness, such as being able to exercise longer, at higher intensity, or with better blood glucose control. These victories, even small ones, reinforce the value of your efforts and encourage continued adherence.
Prepare for Obstacles
Life inevitably presents obstacles to regular exercise—illness, travel, work demands, family obligations, and weather all can interfere with exercise plans. Rather than letting these obstacles derail your routine entirely, plan for them in advance. Have backup plans for when your usual routine isn’t possible. This might include home workout videos for bad weather days, resistance bands for travel, or shorter workouts when time is limited.
Remember that some exercise is always better than none. If you can’t complete your usual 30-minute workout, do 10 minutes instead. If you can’t do your planned activity, do something else. Flexibility and adaptability help maintain consistency even when circumstances aren’t ideal.
Special Considerations for Different Age Groups
Exercise recommendations and safety considerations vary across the lifespan. Age-specific factors should be considered when developing exercise programs for individuals with diabetes and comorbidities.
Older Adults
Older adults with diabetes face unique challenges and considerations for exercise. Age-related changes in muscle mass, bone density, balance, and cardiovascular function affect exercise capacity and safety. However, regular physical activity is particularly important for older adults, as it helps maintain functional independence, prevents falls, and manages multiple chronic conditions.
Less stringent glycemic goals may be appropriate for individuals with significant cognitive and/or functional limitations, frailty, or severe comorbidities or where the harms of treatment, including hypoglycemia, are greater than the benefits, and healthcare providers should deintensify hypoglycemia-causing medications (insulin, sulfonylureas, or meglitinides), or switch to a medication class with lower hypoglycemia risk, for individuals who are at high risk for hypoglycemia, within individualized glycemic goals. This individualization is particularly important when planning exercise programs for older adults.
Balance and fall prevention exercises should be incorporated into routines for older adults. Simple balance exercises can be done daily and significantly reduce fall risk. Strength training is also crucial for maintaining muscle mass and bone density, helping prevent the sarcopenia and osteoporosis common in older adults with diabetes.
Older adults may need longer warm-up and cool-down periods to prepare muscles and joints for activity and prevent injury. They may also require more recovery time between exercise sessions. Listen to your body and don’t push through pain—what feels like normal muscle soreness versus potentially injurious pain becomes more important with age.
Children and Adolescents
Young people with diabetes should be encouraged to participate in regular physical activity, including both structured exercise and unstructured play. Physical activity helps with blood glucose management, weight control, cardiovascular health, and psychosocial well-being. However, children and adolescents with diabetes require special considerations for safe exercise.
Blood glucose monitoring is particularly important for young people, as they may not recognize or communicate hypoglycemia symptoms effectively. Parents, coaches, and school personnel should be educated about diabetes management during physical activity, including how to recognize and treat hypoglycemia.
Adolescents face unique challenges as they transition to independent diabetes management. They may be reluctant to check blood glucose in front of peers or may skip monitoring to avoid feeling different. Work with adolescents to develop strategies that allow for safe exercise while respecting their need for independence and peer acceptance.
Participation in school sports and other organized activities should be encouraged with appropriate planning and support. Communication between parents, healthcare providers, coaches, and school nurses ensures that young people can participate safely in all activities their peers enjoy.
Technology and Exercise Management
Technological advances have revolutionized diabetes management during exercise, making it easier and safer for individuals with diabetes to be physically active.
Continuous Glucose Monitors
Continuous glucose monitors have transformed exercise management for many people with diabetes. A continuous glucose monitor (CGM) can help with checking blood sugar before, during and after exercise to better understand your trends, and this can help you determine whether you’re at a safe blood sugar level to start exercise, and how exercise impacts your blood sugar for the rest of the day.
CGMs provide real-time glucose readings and trend arrows showing the direction and speed of glucose changes. This information allows for proactive management—you can consume carbohydrates when glucose is trending down before it reaches hypoglycemic levels, or adjust insulin when glucose is rising. The ability to see glucose trends rather than just single point-in-time readings is particularly valuable during exercise.
Many CGMs have customizable alerts that can warn of high or low glucose levels, allowing you to take action before problems develop. Some systems integrate with insulin pumps to automatically adjust insulin delivery based on glucose readings, though users should still monitor glucose and be prepared to intervene manually if needed.
CGM data can be downloaded and analyzed to identify patterns in glucose response to different activities. This information helps refine exercise and diabetes management strategies over time. You can share your CGM data with your healthcare provider using Dexcom Clarity to help guide your discussions.
Insulin Pumps and Automated Insulin Delivery Systems
Insulin pumps offer flexibility in insulin delivery that can be particularly helpful for exercise management. Temporary basal rate reductions, extended boluses, and preset exercise modes allow for fine-tuning of insulin delivery around physical activity. This flexibility can reduce hypoglycemia risk while maintaining overall glucose control.
Automated insulin delivery systems, sometimes called artificial pancreas systems or hybrid closed-loop systems, use CGM data to automatically adjust basal insulin delivery. Many of these systems have exercise modes that adjust algorithms to reduce insulin delivery and prevent hypoglycemia during activity. While these systems significantly reduce the burden of diabetes management during exercise, users still need to monitor glucose, carry fast-acting carbohydrates, and be prepared to intervene manually if needed.
Fitness Trackers and Apps
Fitness trackers and smartphone apps can help monitor exercise intensity, duration, and frequency. Heart rate monitors help ensure you’re exercising at appropriate intensity levels, particularly important for those with cardiovascular comorbidities who need to stay within specific heart rate ranges.
Many diabetes management apps now integrate with fitness trackers and CGMs, allowing you to see how exercise affects glucose levels alongside other data like food intake and medication. This integrated view can reveal patterns and relationships that might not be apparent when looking at data in isolation.
Step counters and activity trackers can motivate increased daily movement beyond structured exercise. Accumulating activity throughout the day through increased walking, taking stairs, and other lifestyle activities contributes to overall health and glucose management.
When to Stop Exercising and Seek Medical Attention
While exercise is generally safe and beneficial for people with diabetes, certain symptoms warrant stopping exercise immediately and potentially seeking medical attention. Knowing when to stop and when to seek help is an important safety consideration.
Stop exercising immediately if you experience chest pain, pressure, or discomfort; severe shortness of breath; dizziness or lightheadedness; irregular heartbeat; or severe pain anywhere in the body. These symptoms could indicate serious cardiovascular or other medical problems requiring immediate evaluation.
For diabetes-specific concerns, stop exercising if blood glucose drops below 70 mg/dL and treat the hypoglycemia before resuming activity. If blood glucose is above 300 mg/dL, particularly if ketones are present, postpone exercise until glucose is better controlled. Exercising with very high glucose and ketones can worsen hyperglycemia and increase ketoacidosis risk.
If you experience symptoms of hypoglycemia but cannot check blood glucose, treat as if you are low—it’s better to err on the side of caution. Symptoms of hypoglycemia include shakiness, sweating, confusion, irritability, rapid heartbeat, and hunger. Severe hypoglycemia can cause loss of consciousness and requires emergency treatment.
Seek medical attention if hypoglycemia doesn’t respond to treatment, if you experience repeated episodes of hypoglycemia during or after exercise despite adjustments to medication and food intake, or if you have any concerning symptoms during exercise that don’t resolve quickly with rest.
Working with Healthcare Professionals
Successful exercise management for individuals with diabetes and comorbidities requires ongoing collaboration with healthcare professionals. Your diabetes care team should include multiple specialists who can address different aspects of your care.
Your primary care physician or endocrinologist oversees your overall diabetes management and can adjust medications as needed to support safe exercise. Certified diabetes care and education specialists provide education about diabetes self-management, including exercise strategies, blood glucose monitoring, and problem-solving skills.
Registered dietitian nutritionists can help develop nutrition strategies that support both diabetes management and exercise performance. They can provide guidance on pre-, during-, and post-exercise nutrition and help you understand how different foods affect blood glucose during activity.
Exercise physiologists or physical therapists with expertise in diabetes can design individualized exercise programs that account for your fitness level, health conditions, and goals. They can teach proper exercise technique, suggest appropriate modifications, and help progress your program safely over time.
For those with specific comorbidities, additional specialists may be involved. Cardiologists provide guidance for those with cardiovascular disease, nephrologists for those with kidney disease, podiatrists for those with foot problems, and ophthalmologists for those with retinopathy. Coordinated care among all these providers ensures comprehensive management that addresses all aspects of your health.
Maintain open communication with your healthcare team about your exercise routine, any problems you encounter, and your goals. Bring your glucose logs, exercise records, and any questions to appointments. Don’t hesitate to contact your healthcare provider between appointments if you experience problems or need guidance.
Overcoming Common Barriers to Exercise
Despite understanding the importance of exercise, many people with diabetes face barriers that prevent regular physical activity. Identifying and addressing these barriers is essential for establishing and maintaining an exercise routine.
Fear of Hypoglycemia
Fear of hypoglycemia is one of the most common barriers to exercise for people with diabetes. This fear is understandable, as hypoglycemia can be uncomfortable, frightening, and potentially dangerous. However, with proper planning and monitoring, hypoglycemia risk can be minimized.
Education about hypoglycemia prevention and treatment reduces fear. Understanding how different activities affect your blood glucose, knowing how to adjust medications and food intake, and always carrying fast-acting carbohydrates provides confidence that you can manage hypoglycemia if it occurs. Start with shorter, less intense workouts while you learn how your body responds, then gradually progress as confidence builds.
Lack of Time
Time constraints are a common barrier to exercise for everyone, not just those with diabetes. However, exercise doesn’t require large blocks of time. Short bouts of activity accumulated throughout the day provide health benefits. Three 10-minute walks provide similar benefits to one 30-minute walk.
Look for opportunities to incorporate activity into your daily routine. Take stairs instead of elevators, park farther from destinations, walk during lunch breaks, or do exercises while watching television. These lifestyle activities add up and contribute to overall health even if they don’t feel like “real” exercise.
Prioritize exercise by scheduling it like any other important appointment. Consider it an investment in your health that will pay dividends in improved glucose control, reduced medication needs, better energy levels, and enhanced quality of life.
Physical Limitations and Pain
Comorbidities often bring physical limitations that make exercise challenging. Joint pain, neuropathy, cardiovascular limitations, and other conditions can make traditional exercise difficult or impossible. However, almost everyone can find some form of physical activity that’s appropriate for their capabilities.
Work with healthcare providers to identify activities that are safe and appropriate for your specific limitations. Chair exercises, water activities, and gentle stretching may be options when more vigorous activities aren’t possible. Focus on what you can do rather than what you can’t, and celebrate the activities you are able to perform.
Pain during or after exercise should not be ignored. While some muscle soreness is normal, particularly when starting a new activity, sharp pain, joint pain, or pain that persists or worsens requires evaluation. Pushing through pain can lead to injury and setbacks. Modify activities as needed to avoid pain, and consult healthcare providers about persistent discomfort.
Lack of Motivation
Motivation naturally waxes and wanes, and maintaining long-term exercise adherence can be challenging. Setting specific, measurable, achievable, relevant, and time-bound (SMART) goals helps maintain motivation. Rather than vague goals like “exercise more,” set specific goals like “walk 20 minutes five days per week for the next month.”
Find an accountability partner—a friend, family member, or exercise group who expects you to show up. Social support significantly improves exercise adherence. Many people find that group classes or exercise buddies make workouts more enjoyable and provide motivation on days when exercising alone would be easy to skip.
Track your progress and celebrate successes. Improvements in fitness, glucose control, energy levels, mood, or any other measure deserve recognition. Reward yourself for meeting goals with non-food rewards like new workout clothes, a massage, or a fun outing.
Remember your “why”—the reasons you want to exercise. Whether it’s improving health, having energy to play with grandchildren, reducing medication needs, or simply feeling better, keeping your motivations front of mind helps maintain commitment when motivation lags.
Conclusion: Making Exercise a Sustainable Part of Diabetes Management
Exercise is a powerful tool for managing diabetes and comorbidities, offering benefits that extend far beyond blood glucose control. Regular physical activity improves cardiovascular health, enhances insulin sensitivity, supports weight management, strengthens bones and muscles, improves mental health, and enhances overall quality of life. For individuals managing diabetes alongside other chronic conditions, these benefits are particularly valuable.
However, exercising safely with diabetes and comorbidities requires careful planning, monitoring, and ongoing adjustment. Working closely with your healthcare team to develop an individualized exercise plan that accounts for your specific health conditions, medications, fitness level, and goals is essential. Understanding how different activities affect blood glucose, knowing how to prevent and treat hypoglycemia, and recognizing when to stop exercising and seek help are critical safety skills.
Technology like continuous glucose monitors, insulin pumps, and fitness trackers can make exercise management easier and safer, but they don’t replace the need for education, planning, and vigilance. Regular blood glucose monitoring before, during, and after exercise remains essential, as does carrying fast-acting carbohydrates and exercising in safe environments.
The key to long-term success is creating a sustainable exercise routine that fits your lifestyle, preferences, and capabilities. Start slowly, progress gradually, choose activities you enjoy, and be flexible when obstacles arise. Remember that some exercise is always better than none, and that consistency matters more than intensity, especially when first establishing an exercise habit.
Overcoming barriers to exercise—whether fear of hypoglycemia, time constraints, physical limitations, or lack of motivation—requires problem-solving, support, and persistence. Work with your healthcare team, enlist support from family and friends, and be patient with yourself as you develop new habits and skills.
Exercise is not just about managing blood sugar numbers, though that’s certainly important. It’s about improving your overall health, maintaining functional independence, preventing complications, and enhancing quality of life. The effort invested in learning to exercise safely with diabetes and comorbidities pays dividends in better health, increased energy, improved mood, and greater confidence in your ability to manage your conditions.
For more information about diabetes management and exercise, visit the American Diabetes Association, consult the Centers for Disease Control and Prevention diabetes resources, or speak with your healthcare provider about developing a personalized exercise plan that’s right for you.