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Exercise on GLP-1: How to Protect Muscle While Losing Weight

Aimee Senior
Aug 24
6 min read

When you're taking a GLP-1 medication like Zepbound, Wegovy, Mounjaro, or Ozempic, it's easy to make weight loss the primary goal.


But there's another question I want you to think about:


What kind of weight are you losing?


When we lose weight, we don't necessarily lose only body fat. Some lean muscle mass can be lost along the way—particularly when weight loss is rapid, protein intake is inadequate, or we aren't regularly challenging our muscles.


That's why exercise on GLP-1 medications should focus heavily on maintaining muscle, not simply burning as many calories as possible.


My general goal is around 150 minutes of exercise per week, with an emphasis on strength and resistance training, divided throughout the week.


Here's why.


Women in a gym hold barbells across their shoulders during a deep squat, focused and determined in front of brick walls and windows.

Why Strength Training Matters on a GLP-1


GLP-1 medications can make it significantly easier to eat less and lose weight.


But eating fewer calories doesn't tell your body that you specifically want to lose fat while keeping your muscle.


Resistance training provides an important stimulus that tells your body:


We still need this muscle.


Maintaining muscle is important for much more than appearance. Muscle supports:


  • Strength

  • Mobility

  • Balance

  • Bone health

  • Metabolic health

  • Healthy aging

  • Ability to perform everyday activities

  • Long-term weight management


The number on the scale is only one measurement of progress.


Losing 30 pounds while maintaining as much muscle as possible is a very different outcome than losing 30 pounds while losing a significant amount of muscle along with it.


My Exercise Goal: Around 150 Minutes Per Week


For most people who are medically cleared to exercise, I recommend working toward approximately 150 minutes of exercise per week, with resistance training making up a significant portion of that time.


You don't need to do it all at once.


In fact, I would rather see exercise spread consistently throughout the week.


For example, you might do:


  • 30 minutes, 5 days per week

  • 50 minutes, 3 days per week

  • 40 minutes, 4 days per week

  • Several shorter sessions that total approximately 150 minutes


The exact schedule matters less than finding something you can realistically maintain.


Aim for Strength Training at Least 3 Days Per Week


My recommendation is generally to include strength or resistance exercise at least three days per week.


I also prefer not to have more than about three days between strength-training sessions when possible.


Why?


Muscle responds to regular resistance stimulus. During a period of calorie restriction and active weight loss, we want to consistently give your body a reason to maintain that metabolically and functionally valuable tissue.


Three strength-focused sessions spread throughout the week provides a practical way to keep that stimulus consistent while still allowing time for recovery.


For example:


Monday: StrengthWednesday: StrengthFriday: Strength

Or:

Tuesday: StrengthThursday: StrengthSaturday: Strength


You don't need to strength train every day.


Consistency is much more important.


Strength Training Doesn't Have to Mean Going to a Gym


When I say "strength training," I don't necessarily mean you need to join a gym or start lifting extremely heavy weights.


Resistance can come from many different sources.


Options include:


  • Dumbbells

  • Resistance bands

  • Weight machines

  • Bodyweight exercises

  • Kettlebells

  • Pilates

  • Functional resistance exercises


Squats, lunges, rows, presses, hinges, step-ups, and other movements can all be incorporated depending on your ability and fitness level.


The goal is to challenge your muscles enough that they have a reason to adapt and stay strong.


Strength First, Cardio Second


If you're combining strength training and cardio in the same workout, I generally recommend:


Strength first. Cardio afterward.


Why?


If you spend 30–45 minutes exhausting yourself with cardio before you ever pick up a weight, you may have less energy available for your strength workout.


Your muscles are already fatigued, which can make it harder to perform resistance exercises effectively and progressively.


If maintaining muscle is one of our major priorities during weight loss, I don't want strength training to consistently get whatever energy is left over.


Instead, try:

Warm up → Strength training → Cardio if desired


This allows you to put your best effort toward resistance training first.


Do You Need Cardio?


Cardiovascular exercise is still incredibly valuable.


Walking, jogging, cycling, swimming, hiking, dancing, and other aerobic activities can support:


  • Cardiovascular health

  • Endurance

  • Blood sugar management

  • Mood

  • Stress management

  • Daily movement

  • Overall health


I'm not anti-cardio.


I simply don't want cardio to replace strength training, particularly during significant weight loss.


If you enjoy cardio, keep doing it.


If you're combining cardio and strength during the same workout, put your strength work first when muscle preservation is the priority.


Walking Is Great—But It Isn't the Same as Strength Training


Walking is one of my favorite forms of movement.


It's accessible, low impact, beneficial for cardiovascular and metabolic health, and easy to incorporate into daily life.


Keep walking.


But walking generally doesn't provide the same resistance stimulus as dedicated strength training.


So if you're getting 10,000 steps every day but doing no resistance exercise, I would still encourage you to add strength training.


Think of them as serving different purposes.


Walking supports overall activity and cardiovascular health. Strength training helps challenge and preserve your muscle.


Ideally, you get some of both.


Protein and Strength Training Work Together


You can do an excellent strength-training program and still make muscle preservation harder if you're barely eating.


Likewise, eating plenty of protein doesn't replace the need to actually use your muscles.


Protein + resistance training is the combination we're looking for.


Your individual protein needs depend on your body size, activity level, age, health history, and goals, but getting adequate protein becomes particularly important when you're losing weight.


Try to spread protein throughout the day rather than eating very little all day and attempting to catch up at dinner.


Make Sure You're Eating Enough to Exercise on GLP-1


Another issue I frequently see with GLP-1 medications is people trying to exercise while barely eating.


If you're consistently feeling:


  • Weak

  • Lightheaded

  • Shaky

  • Extremely fatigued

  • Unable to finish workouts you normally tolerate

  • Sore for unusually long periods

  • Like your strength is rapidly declining


Take a look at your nutrition and hydration.


Your body needs fuel to exercise and recover.


The solution isn't always to push harder.


Sometimes we need to make sure you're eating enough protein, getting adequate overall calories, including carbohydrates, staying hydrated, and allowing appropriate recovery.


Don't Judge Your Workout by Calories Burned


Your watch doesn't need to tell you that you burned 500 calories for a workout to "count."


In fact, calorie burn is not the primary reason I want you strength training on a GLP-1.


I want you building or maintaining:


Strength. Muscle. Function.


You may finish a strength workout having burned fewer calories than you would during a long cardio session.


That doesn't make the workout less valuable.


Your exercise routine should support what you want your body to be capable of—not simply make the calorie deficit as large as possible.


Progressive Resistance Matters


If you've been doing the exact same workout with the exact same resistance for months and it feels easy, your muscles have less reason to continue adapting.


As you become stronger, gradually challenge yourself.


That might mean:


  • Increasing the weight

  • Increasing resistance

  • Adding repetitions

  • Adding another set

  • Improving your range of motion

  • Choosing a more challenging variation

  • Improving control and technique


You don't have to increase something every workout.


The overall goal is simply to continue challenging your muscles appropriately over time.


What If You're Just Starting Exercise?


You don't have to go from zero exercise to 150 minutes and three full strength workouts overnight.


Start where you are.


Maybe your first goal is two 15-minute strength sessions and a few walks each week.


Then gradually build.


A sustainable routine that you actually continue doing is far more valuable than an aggressive workout plan you abandon after two weeks.


If you have significant joint pain, mobility limitations, cardiovascular concerns, injuries, or other medical conditions, talk with your healthcare provider and consider working with an appropriately qualified exercise professional.


The Goal Isn't Just a Smaller Body—It's a Stronger One


GLP-1 medications can be powerful tools for weight loss.


But I don't want the only goal to be making the number on the scale smaller.


I want you to come out of the weight-loss process strong, adequately nourished, active, and capable of maintaining those habits long term.


For many people, that means working toward around 150 minutes of exercise per week, prioritizing resistance training at least three days per week, spreading those sessions throughout the week, and performing strength work before cardio when they're combined in the same workout.


Combine that with adequate protein, enough overall nutrition, good hydration, and appropriate recovery.


That's a much more complete approach to health than simply trying to burn as many calories as possible.



Related GLP-1 Resources

If you're working on maintaining muscle and supporting your health while taking a GLP-1, you may also find these helpful:

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