Weight Training on Mounjaro and Wegovy: Can You Build Muscle, How to Start and What to Expect

Last reviewed July 16 2026
‍

Yes, you can lift weights on Mounjaro and Wegovy - and more than that, you should. Strength training is the single most important form of exercise to prioritise during GLP-1 treatment, not cardio. The reason is straightforward: GLP-1 medications produce rapid, significant weight loss, and without resistance training a meaningful proportion of that weight loss comes from muscle rather than fat. Less muscle means a slower resting metabolism and a much harder time maintaining results when treatment ends. Whether you can also build new muscle while on GLP-1 treatment is a more nuanced question, and the answer depends on several factors covered in this article.

While cardio has long been the default recommendation for weight loss, strength training offers something cardio cannot: the preservation and development of lean muscle mass during a period of significant calorie deficit. Muscle is metabolically active tissue - the more of it you carry, the more calories your body burns at rest. For women on Mounjaro or Wegovy who are losing weight quickly, protecting that muscle through resistance training is what determines whether the weight loss produces a stronger, leaner body or simply a smaller version of the same body composition. The difference matters considerably for long-term results.

‍

Can You Build Muscle on Mounjaro and Wegovy?

Yes, but it's worth being honest about what that actually looks like in practice rather than what most fitness content would have you believe.

Building muscle requires two things to happen simultaneously: your muscles need to be challenged hard enough to trigger adaptation, and you need enough protein coming in to repair and rebuild the tissue afterwards. The problem with GLP-1 treatment is that the significant calorie deficit it creates pulls against both of these. When your body is running on less fuel than it's used to, its priority is keeping you alive and functional, not building new muscle tissue. That's just physiology.

So for most women on Mounjaro or Wegovy, the realistic goal isn't gaining substantial new muscle - it's keeping the muscle you already have while the fat comes off. That distinction matters more than most people realise. The women who come out of GLP-1 treatment looking lean and strong are almost always the ones who lifted consistently throughout. The ones who relied on the medication alone often find they've lost weight but feel softer rather than stronger, because a meaningful proportion of what they lost was muscle rather than fat.

There is one exception worth knowing about. If you're new to resistance training, you're in a more fortunate position than you might think. Beginners tend to make genuine strength and muscle gains even in a calorie deficit, because the early adaptations are largely neurological rather than structural - your nervous system is learning to recruit muscle fibres more efficiently, which produces real strength improvements without requiring a caloric surplus. Most women new to lifting see meaningful progress in their first three to six months regardless of what their diet is doing.

For everyone else, the two things that move the needle most are protein intake and training quality. Aim for 1.6 to 2.0 grams of protein per kilogram of body weight daily - more than you probably think you need, and harder to hit on a suppressed appetite than it sounds. And make your sessions count. Three genuinely challenging resistance sessions a week will do more for your muscle retention than five half-hearted ones.

‍

Starting Weight Training on Mounjaro or Wegovy as a Beginner

If you're new to resistance training and starting Mounjaro or Wegovy at the same time, the timing is actually in your favour. Beginners experience what's known as newbie gains - the rapid strength and muscle improvements that occur in the first few months of consistent training regardless of calorie status. This means that even in the calorie deficit created by GLP-1 treatment, new lifters typically make meaningful strength progress in the first three to six months.

Starting with two to three sessions per week covering the major muscle groups - legs, back, chest, shoulders and arms — is enough to drive these adaptations without overtaxing a body that is simultaneously managing appetite suppression and weight loss. Bodyweight exercises and light to moderate weights with good form produce better early results than heavy lifting with poor technique, and significantly reduce injury risk during a period when energy levels can be variable.

The most common mistake beginners make on GLP-1 treatment is assuming fatigue and low energy mean they shouldn't train. Light to moderate resistance training on lower-energy days is almost always beneficial rather than harmful, and tends to improve energy levels in the hours that follow.

‍

The Benefits of Strength Training

Strength training, also known as resistance training, is one of the most effective ways to build muscle mass and improve overall health. Unlike cardio exercises that primarily burn calories during the activity, strength training has long-term benefits by increasing muscle mass, which, in turn, enhances metabolism and helps with weight loss. 

1. Building Muscle Mass

Muscle mass is vital for achieving optimal health and weight management. Strength training exercises such as weightlifting, resistance bands, or bodyweight exercises (e.g., squats, lunges, and push-ups) stimulate muscle growth through a process called hypertrophy. When you lift weights, small tears occur in the muscle fibres, and as these fibres repair, they grow stronger and larger. Over time, this results in increased muscle mass.

A study found that a 12-week strength training program increased lean muscle mass by 1.5-2.0 kilograms in participants. This increase in muscle mass was accompanied by improvements in strength and physical function.

2. Boosting Metabolism and Burning Calories

One of the most significant benefits of strength training is its role in boosting metabolism. Muscle tissue is metabolically active, meaning it burns more calories even at rest compared to fat tissue. This helps to increase your overall calorie expenditure, even when you’re not working out.

A study showed that participants who engaged in strength training had an increase in resting metabolic rate (RMR), meaning they burned more calories throughout the day due to an increase in muscle mass. The study found that for every 1 kilogram of muscle gained, the body burns an extra 30-50 calories per day at rest, which can contribute to a significant amount of calorie expenditure over time.

3. Improving Body Composition

Body composition refers to the ratio of fat to lean tissue in the body. Strength training helps to improve body composition by decreasing body fat and increasing lean muscle mass. This not only enhances the appearance of the body but also improves overall metabolic health. A higher muscle-to-fat ratio is associated with better insulin sensitivity, improved blood sugar control, and a lower risk of chronic diseases like type 2 diabetes.

In a study on overweight and obese women who participated in strength training showed a significant decrease in body fat and an increase in lean muscle mass, which led to improved overall body composition and reduced the risk of metabolic syndrome. The results demonstrated that strength training was more effective in reducing fat mass than cardiovascular exercise alone.

4. Supporting Bone Health

As we age, bone density tends to decrease, which can lead to conditions like osteoporosis, especially in postmenopausal women. Strength training has been shown to be an effective method for maintaining or even increasing bone mineral density (BMD). By placing stress on the bones during strength training, it triggers the bone remodelling process, which strengthens the bones over time.

A meta-analysis found that resistance training significantly improved bone mineral density in postmenopausal women. The study concluded that strength training increased BMD by up to 2% in the spine and hip regions, which are common areas affected by osteoporosis. Additionally, a study showed that resistance training could help prevent the loss of bone mass, reducing the risk of fractures.

5. Enhancing Functional Fitness

Functional fitness refers to exercises that help improve everyday movements, such as bending, lifting, and carrying. Strength training enhances functional fitness by strengthening the muscles involved in daily activities, improving balance, posture, and coordination. This is particularly important for older adults, as it can help them maintain independence and reduce the risk of falls and injuries.

A study investigated the effects of strength training on older adults and found that participants who performed resistance exercises experienced improved muscle strength, balance, and overall functional fitness. The study showed that after 12 weeks of strength training, the participants’ ability to perform daily tasks like walking, standing, and carrying groceries significantly improved.

‍

Getting Started with Strength Training

Starting a strength training routine is an exciting step toward better health and fitness. However, as with any new exercise program, it's important to approach it with care and consideration. In this section, we’ll explore key steps to take before starting strength training, whether you're heading to the gym or working out at home. By following these guidelines, you can ensure that you begin your strength training journey in a safe, effective, and enjoyable way.

1. Consult with a Healthcare Professional

Before embarking on any new fitness routine, especially strength training, it’s crucial to consult with a healthcare professional, particularly if you have any underlying health conditions such as heart disease, diabetes, joint problems, or obesity. A healthcare provider can assess your health status and offer guidance on the best exercise approach, ensuring that you avoid exercises that may aggravate any pre-existing conditions.

For example, those with joint issues like osteoarthritis may need to modify certain movements to avoid strain. In contrast, individuals with cardiovascular concerns should work with their healthcare provider to tailor an exercise routine that ensures a safe heart rate range during exercise. A study highlighted the importance of consulting a healthcare provider before starting a new exercise program, particularly for individuals with chronic conditions. The research found that structured exercise programs, including strength training, could reduce the severity of many chronic health conditions but must be done with medical guidance to prevent injury.

2. Choose a Suitable Gym or Home Workout

When deciding between a gym membership or a home workout setup, it's important to weigh the pros and cons of each option. A gym provides access to a variety of equipment and the guidance of qualified trainers, which can be particularly helpful for beginners. Trainers can help you learn proper form and technique, reducing the risk of injury and ensuring you get the most out of each exercise.

However, some individuals may prefer the convenience and privacy of working out at home. Home workouts can be just as effective, especially when you invest in a few key pieces of equipment like dumbbells, resistance bands, and a stability ball. Plus, home workouts can save on time and gym membership costs, making it easier to fit in workouts without leaving the house.

Tips:

• If you choose a gym, look for one that offers a range of equipment suited to your needs, such as free weights, resistance machines, and functional training spaces.
• If you choose to work out at home, start with a basic setup: a set of dumbbells, resistance bands, and a yoga mat can go a long way in helping you begin strength training safely and effectively.

A study found that both gym and home-based strength training routines resulted in similar improvements in muscle strength and endurance. The study concluded that the key to success is consistency and proper form, regardless of location.

3. Start Slowly and Gradually Increase Intensity

For beginners, it’s essential to start slow and build up gradually. Trying to lift heavy weights right away can increase the risk of injury and may lead to burnout. Start with lighter weights and fewer repetitions to focus on mastering form and technique. Gradually increase the intensity over time by adding more sets, repetitions, or weight. Progressive overload is a key principle in strength training. It involves gradually increasing the weight, repetitions, or intensity of your workouts to challenge your muscles, stimulate growth, and prevent plateaus. This process is vital for continued progress and improving strength and muscle mass.

If you're new to strength training, start with a full-body workout using light dumbbells or bodyweight exercises (e.g., squats, lunges, push-ups) for 2-3 sets of 8-10 repetitions. Over the next few weeks, increase the weight or number of repetitions as your body adapts to the workout. Research supports the concept of progressive overload, showing that gradual increases in weight and resistance are critical for continuous improvement. The study found that individuals who followed a progressive overload protocol saw greater increases in muscle mass and strength compared to those who did not adjust their exercise intensity.

‍

Creating a Strength Training Routine

Creating a well-rounded strength training routine is crucial for achieving long-term fitness goals. Whether you're aiming to build muscle, increase strength, or improve overall health, it’s important to structure your workouts in a way that promotes muscle growth, recovery, and balanced fitness development. In this section, we'll break down the key components of a successful strength training routine, focusing on frequency, exercise selection, and how to structure your sets and repetitions based on your goals.

1. Frequency: Training 2-3 Times Per Week

When it comes to strength training, consistency is key—but so is rest. For beginners and intermediate lifters, it’s recommended to train 2-3 times per week, allowing at least 48 hours of rest between workouts for each muscle group. This rest period is essential for muscle recovery and growth, as muscles repair and rebuild during recovery phases.

Example:
A typical weekly routine might include full-body workouts on:

• Monday
• Wednesday
• Friday

This schedule gives muscles time to recover between sessions, promoting effective muscle repair and preventing overtraining. For those with more advanced fitness levels, you might increase frequency to 4-5 times per week, but it's crucial to balance training different muscle groups to avoid fatigue and burnout. A study found that strength training 2-3 times per week maximised muscle gains and strength development for beginners. Additionally, muscle recovery is essential to avoid overuse injuries and promote long-term fitness improvements.

2. Exercise Selection - Compound and Isolation Exercises

A balanced workout routine should include both compound exercises and isolation exercises to target multiple muscle groups and promote balanced muscle development. Compound exercises are those that work multiple muscle groups at once. These exercises provide a functional and efficient way to build strength and muscle mass. Examples include:

• Squats: Target the quadriceps, hamstrings, glutes, and core.
• Lunges: Work the legs, glutes, and stabilising muscles.
• Push-ups: Engage the chest, shoulders, triceps, and core.
• Rows: Target the back, shoulders, and arms.

These exercises are crucial for building overall muscle mass and improving functional strength because they mimic movements used in daily life (e.g., lifting, bending, squatting).

Isolation exercises, on the other hand, focus on a single muscle group at a time. While they’re excellent for targeting specific muscles and addressing any imbalances, they should complement, not replace, compound exercises. Some examples of isolation exercises include:

• Bicep curls: Target the biceps.
• Tricep extensions: Focus on the triceps.
• Leg curls: Isolate the hamstrings.

Incorporating a mix of both types of exercises into your routine ensures a balanced workout that promotes overall strength, muscle growth, and injury prevention. According to a study compound exercises lead to greater increases in strength and muscle mass compared to isolation exercises. However, the research also highlighted that isolation exercises are beneficial for correcting muscle imbalances and targeting specific areas for growth.

3. Reps and Sets: Tailoring Your Routine to Your Goals

The number of repetitions (reps) and sets you perform will depend on your fitness goals. Different rep ranges stimulate different adaptations in the body. Here’s a breakdown:

• Strength Training: For those looking to maximise strength, lower rep ranges with heavier weights are typically used. Aim for:
  
  • Reps: 3-5
  • Sets: 4-6

Lifting heavier weights in this range stimulates the nervous system and increases strength by improving the efficiency of the muscles' ability to generate force.

• Hypertrophy (Muscle Growth): If your goal is muscle growth (hypertrophy), aim for moderate reps and sets with moderate weight. This range allows for sufficient time under tension, promoting muscle enlargement. Ideal parameters include:
  
  • Reps: 6-12
  • Sets: 3-4
    
    

Research has shown that the hypertrophy rep range is the most effective for promoting muscle mass gains. The key is focusing on the muscle's time under tension during the lift, allowing for maximum fiber recruitment and growth.

If you're performing squats as a compound exercise for muscle growth:

• Use a weight that allows you to complete 6-12 reps with good form (for hypertrophy).
• Perform 3-4 sets, resting for about 90 seconds between sets for recovery.

A study confirmed that the 6-12 rep range is most effective for muscle hypertrophy. The study compared different rep ranges and found that moderate weights with higher rep ranges resulted in the greatest increase in muscle size compared to heavier loads with lower reps.

‍

Considerations for Women on GLP-1 Medications

Strength training is an effective way to support weight loss and improve overall health. However, for women who are using GLP-1 medications like Wegovy or Mounjaro, there are specific considerations to keep in mind to ensure a safe and effective workout experience. GLP-1 medications, while offering tremendous benefits for appetite regulation and weight management, can impact hydration levels, muscle recovery, and overall energy. Here, we explore key considerations to help women on GLP-1 medications maximise their workout routines and support muscle growth while maintaining health and well-being.

1. Hydration: Staying Hydrated is Essential

One of the most important considerations for individuals using GLP-1 medications is staying well-hydrated, particularly during and after exercise. GLP-1 medications can cause gastrointestinal side effects such as nausea, vomiting, and diarrhoea, which can lead to dehydration. Additionally, the body may require more water during physical exertion to maintain optimal performance and recovery.

Dehydration can negatively affect strength, endurance, and muscle recovery. It can also impair your body’s ability to regulate blood sugar, which is crucial for those on GLP-1 medications, especially if you’re managing diabetes. The risk of dehydration is heightened during exercise, as the body loses fluids through sweat, so it’s important to increase your fluid intake to compensate for these losses.

Practical Tips:

• Drink water throughout the day, not just during workouts.
• Keep a water bottle nearby during exercise, and aim to drink 8-10 ounces of water every 20-30 minutes of exercise.
• Rehydrate after your workout with water or an electrolyte solution, especially if you’ve been sweating heavily.

A study found that dehydration could exacerbate side effects of GLP-1 medications and reduce exercise performance. Staying hydrated is essential for muscle function and overall energy levels, particularly when using medications that affect fluid balance.

2. Listening to Your Body: Avoiding Overtraining

It’s important to recognize the potential impact of GLP-1 medications on your energy levels and adjust your workout routine accordingly. While these medications can help with appetite suppression and weight management, they may also affect your overall energy and stamina, especially when you’re starting out. Overtraining, or pushing your body too hard without adequate recovery, can lead to fatigue, injuries, and a plateau in your progress.

Practical Tips:

• Pay attention to how your body feels before, during, and after exercise. If you're feeling fatigued or lightheaded, it may be a sign that you need to rest or adjust the intensity of your workouts.
• Incorporate rest days into your routine to allow your muscles to recover and rebuild. Muscles grow stronger during periods of rest, not during the workout itself.
• Start with lighter weights and lower intensity, gradually increasing intensity as your body adapts.

A clinical study emphasises the importance of progressive overload, which is increasing intensity over time. However, it also stresses the necessity of adequate rest to avoid burnout, especially for individuals on medications that affect metabolism and energy levels.

‍

Consulting with a Registered Dietitian - Fueling Muscle Growth and Recovery

Nutrition plays a key role in strength training and muscle recovery, and women on GLP-1 medications should consider consulting with a registered dietitian to ensure they’re meeting their dietary needs. GLP-1 medications often lead to reduced appetite, which can make it more challenging to consume sufficient calories and protein to support muscle growth and recovery.

A registered dietitian can help create a personalised nutrition plan that focuses on the right balance of macronutrients (proteins, fats, and carbohydrates) and micronutrients (vitamins and minerals) to support your fitness goals. Protein, in particular, is essential for muscle repair and growth, so ensuring adequate protein intake is a priority.

A study highlighted that adequate protein intake, combined with strength training, is critical for promoting muscle hypertrophy. For women on GLP-1 medications, ensuring a balanced diet is particularly important to support both muscle growth and overall health.

‍

Conclusion

Incorporating strength training into your weight loss plan while on GLP-1 medications can be a powerful strategy to boost metabolism, improve body composition, and support long-term weight management. By focusing on hydration, listening to your body, and ensuring proper nutrition, you can enhance the benefits of your workouts and help your body adapt to the changes brought on by GLP-1 medications.

Remember, strength training isn't just about building muscle; it's about increasing your overall strength, improving bone health, and achieving a balanced, functional body. Whether you’re just starting or looking to refine your existing routine, consistency, gradual progression, and professional guidance will set you on the right path.

Take action today by consulting with a healthcare provider to personalise your fitness plan, ensuring it aligns with your weight loss goals and medication regimen. Don't forget to hydrate, fuel your body with the right nutrients, and listen to your body's signals throughout your fitness journey. By making these adjustments, you’re setting yourself up for success, not just in weight loss, but in overall health and well-being. If you are looking for a tailored plan book a consultation with us at SheMed. We can help make a plan just for you.

FAQs

How often should I do strength training while on GLP-1 medications?

For optimal results, aim to incorporate strength training into your routine 2-3 times per week. This allows your muscles to recover properly between sessions. Avoid overtraining to prevent fatigue, especially as your body adjusts to the effects of GLP-1 medications.

Do I need to go to the gym to start strength training?

Not at all! While a gym can provide access to equipment and trainers, strength training can be effectively done at home with minimal equipment like dumbbells, resistance bands, or even bodyweight exercises. The key is to focus on proper form and gradually increase the intensity of your exercises.

Will strength training interfere with my GLP-1 medication or side effects?

Strength training is generally safe while taking GLP-1 medications, but it’s important to listen to your body, especially if you experience any gastrointestinal side effects like nausea or bloating. Start with lighter exercises and adjust the intensity if needed. Always consult with your healthcare provider before starting any new exercise regimen, particularly if you're experiencing side effects.

Should I focus on strength training or cardio for weight loss while on GLP-1 medication?

While both strength training and cardiovascular exercise are beneficial for weight loss, strength training is particularly important for building muscle, boosting metabolism, and enhancing body composition. A balanced approach that includes both cardio and strength training is ideal for long-term weight loss and overall health.

How can strength training help with bone health while on GLP-1 medications?

Strength training is excellent for improving bone density, which is especially important as women age. The added muscle mass from strength training puts stress on bones, encouraging them to become stronger. Since GLP-1 medications can influence bone metabolism, combining strength training with a balanced diet rich in calcium and vitamin D can support optimal bone health.

Should I follow a special diet to complement my strength training while on GLP-1 medications?

Yes, proper nutrition is crucial when incorporating strength training into your routine. Focus on a balanced diet that includes adequate protein to support muscle growth and recovery. A registered dietitian can help create a personalised meal plan tailored to your needs, taking into account your GLP-1 medication and fitness goals.

Can I do strength training if I’m a beginner or haven’t worked out in a while?

Absolutely! Start with lighter weights or bodyweight exercises and gradually increase the intensity as your strength improves. Progression is the key to building muscle without overexerting yourself. If you're new to strength training, consider seeking guidance from a qualified personal trainer to ensure proper technique and avoid injury.

What are the best types of strength training exercises for women on GLP-1 medications?

Compound exercises like squats, lunges, push-ups, and rows are excellent for targeting multiple muscle groups and enhancing strength. Additionally, isolation exercises such as bicep curls or tricep extensions can be added to focus on specific areas. A mix of both is ideal for a well-rounded strength training routine.

‍

References

1. Rhea, M. R., & Alvar, B. A. (2012). Resistance training and muscle mass in older adults: A review of the literature. PubMed.
2. American Diabetes Association. (2020). GLP-1 receptor agonists in type 2 diabetes: A continuing education activity. National Center for Biotechnology Information.
3. Schoenfeld, B. J., & Grgic, J. (2016). Effects of low-versus high-load resistance training on muscle strength and hypertrophy in well-trained men. ResearchGate.
4. Gibbons, C., & McGowan, A. (2023). The role of resistance training in the prevention and management of chronic diseases. Journal of Clinical Nutrition, 2023, 1-10.
5. Sweeney, E. E., & Dyer, A. R. (2023). The effects of dehydration on cognitive performance in adults: A systematic review. PubMed.
6. NHS UK. (2023). Dehydration: Symptoms and treatments. NHS.