GLP-1 strength and exercise
Why Strength Training Matters on GLP-1
Losing weight is only part of the goal. Strength training can help you maintain the muscle, strength and physical function you want to keep as your body changes.
Why is strength training important while taking GLP-1 medication?
Significant weight loss normally involves losing some lean tissue as well as body fat. Resistance training gives your muscles a reason to keep working and is one of the most useful strategies for supporting strength and preserving fat-free mass while you lose weight.
Ideally, combine strength training with adequate protein, regular daily movement and cardiovascular exercise.
When you are taking GLP-1 medication, it is easy to judge progress almost entirely by the number on the scale.
But the scale cannot tell you exactly what you are losing.
Most weight lost is body fat, which is the goal. But significant weight loss usually includes some loss of lean tissue too.
A 2026 systematic review and meta-analysis of 20 randomised controlled trials involving 15,782 people found that lean mass represented around 25% to 39% of total weight lost with incretin-based medications, depending on the treatment studied.
Importantly, the proportion was broadly comparable with lifestyle-led weight loss. The lifestyle programmes that included resistance training showed better preservation of lean mass.
Read the 2026 systematic review on PubMed
Lean mass is not exactly the same thing as muscle. It also includes water, organs and other non-fat tissue.
So a reduction in lean mass should not automatically be interpreted as severe muscle loss or as evidence that everybody taking GLP-1 medication becomes weaker.
The practical message is simpler:
If you are losing a significant amount of weight, supporting your muscle and physical strength deserves attention too.
For a deeper look at muscle during weight loss, read: How to Protect Muscle While Losing Weight on GLP-1 .
In short: GLP-1 medication can help you lose weight, but the scale cannot tell you what that weight is made of. Strength training helps you focus not only on becoming lighter, but on remaining physically strong while your body changes.
Resistance training: the other half of the equation
Protein and resistance training have different jobs.
Protein provides the building materials.
Your body needs amino acids from dietary protein to maintain and repair muscle.
Resistance training provides the stimulus.
When your muscles repeatedly work against resistance, your body receives a reason to maintain and adapt that tissue.
Resistance training provides the reason to use them.
This becomes particularly important when you are eating less and losing weight.
A 2025 systematic review and meta-analysis found that adding resistance exercise to dietary weight loss helped reduce the loss of fat-free mass and improved muscular strength compared with dietary weight loss alone.
Read the resistance training and weight-loss meta-analysis
You do not need to train like a bodybuilder.
You simply need to give your muscles something meaningful to work against.
In short: Eating protein matters, but nutrition alone does not provide the same muscular stimulus as resistance exercise. Protein and strength training work together.
Build a stronger body as your weight changes
Strength
Stay strong for everyday activities and the things you enjoy doing.
Muscle
Maintain the muscle that supports your movement, strength and physical function.
Bone health
Weight-bearing and resistance exercise help provide the mechanical loading that supports bone strength.
Long-term health
Maintain the strength and mobility that help you stay active and independent.
Strength training is not only about changing how your body looks.
Muscular strength helps you get out of a chair, climb stairs, carry shopping, lift luggage, move comfortably and continue doing the activities you enjoy.
The NHS recommends muscle-strengthening exercise alongside aerobic activity as part of a healthy weekly activity pattern.
Read the NHS physical activity guidelines
In short: Strength training supports far more than appearance. It helps protect the strength, movement and physical capability you want to keep as your body weight changes.
What counts as strength training?
Strength training means working your muscles against resistance.
The resistance can come from your own bodyweight, equipment or external loads.
Bodyweight
- Squats
- Sit-to-stands
- Wall press-ups
- Press-ups
- Lunges
- Step-ups
Resistance bands
- Rows
- Presses
- Pulls
- Leg exercises
- Shoulder exercises
Weights
- Dumbbells
- Kettlebells
- Barbells
- Resistance machines
There is no requirement to lift extremely heavy weights.
What matters is that the resistance makes your muscles work harder than they normally do.
The CDC recommends performing muscle-strengthening activities to the point where completing another repetition would eventually become difficult. Around 8 to 12 repetitions can be a practical starting range for many exercises.
See the CDC guide to what counts as strength training
In short: Strength training is defined by muscular resistance and effort, not by whether you are standing in a gym.
Strength training vs cardio: what is the difference?
Ideally, your exercise programme includes both.
But strength training and cardio have different primary jobs.
| Strength training | Cardio | |
|---|---|---|
| Main target | Muscles | Heart and lungs |
| Examples | Weights, bands, squats, rows, presses | Brisk walking, cycling, swimming, jogging |
| Primary benefit | Strength and muscular capacity | Aerobic fitness and stamina |
| During weight loss | Helps preserve fat-free mass and strength | Supports cardiovascular fitness and overall health |
| Calories during exercise | Uses energy during the workout | Uses energy during the workout |
| After exercise | Demanding resistance exercise can keep energy expenditure elevated during recovery | Moderate steady-state cardio usually produces a smaller and shorter post-exercise effect |
If you have limited time, prioritise strength training
A well-rounded programme includes both cardio and strength training.
But if your structured exercise time is very limited and your priority while losing weight is to maintain muscle, strength and physical function, make sure resistance training is not the part that gets left out.
A practical starting point is two full-body strength sessions each week, while continuing to move throughout the day and adding cardiovascular exercise where your schedule allows.
That does not mean cardio is unimportant.
Cardio provides benefits for heart health, cardiorespiratory fitness and stamina that strength training does not completely replace.
The goal is not to choose one forever.
It is to understand why both exist and what each one is doing for you.
Think about their jobs differently
Cardio: trains your heart, lungs and aerobic fitness.
Strength training: challenges your muscles and helps maintain strength and fat-free mass during weight loss.
The afterburn effect: strength training keeps working after the workout
There is another difference between resistance training and moderate steady-state cardio that is often overlooked.
During cardio, such as brisk walking, cycling or swimming, your body uses more energy while you are exercising.
Most of the additional calorie expenditure from a moderate steady-state cardio session happens during the activity itself.
Your metabolism does not immediately return to normal the second you stop exercising, but the post-exercise increase is usually relatively small after moderate steady-state cardio.
Resistance training can create a greater recovery demand.
After you finish a challenging strength session, your body still has work to do.
It needs energy to support processes involved in recovery, including:
- restoring energy stores used during exercise
- returning body temperature towards resting levels
- supporting circulation and recovery
- repairing and remodelling muscle tissue
- recovering from the physical stress of the workout
This continued increase in oxygen and energy use after exercise is called excess post-exercise oxygen consumption, or EPOC.
You may know it as the afterburn effect.
Most additional energy use happens during the activity
Strength training
Energy use during exercise + greater recovery demand afterwards
How long can the afterburn effect last?
It depends on the intensity, duration and type of exercise.
One controlled study compared equal-calorie sessions of resistance training, moderate steady-state cardio and high-intensity interval exercise.
Resting metabolic rate remained elevated at both 12 hours and 21 hours after the resistance-training session. High-intensity interval exercise produced a similar prolonged effect, while the moderate steady-state aerobic session did not show the same elevation at those time points.
Read the EPOC comparison study on PubMed
The afterburn effect is real, but keep it in perspective
Strength training can keep your body using more energy during recovery after the workout has finished.
But this does not mean you burn hundreds of additional calories while sitting on the sofa.
The effect varies between people and workouts and should be viewed as an additional benefit, not the main reason to lift weights.
High-intensity cardio can also produce a meaningful afterburn effect, so EPOC is not exclusive to resistance training.
The important comparison is with moderate steady-state cardio.
Strength training and high-intensity exercise can create a greater post-exercise recovery demand than an easy or moderate steady-state cardio session.
More importantly, resistance training also gives you something cardio cannot completely replace: a direct muscular stimulus.
In short: Moderate cardio burns most of its exercise-related energy while you are moving. Challenging strength training can keep energy expenditure elevated during recovery for hours afterwards. The afterburn effect is a bonus. Maintaining muscle and strength is the bigger reason to resistance train.
What actually counts as cardio?
Cardio is not simply another word for moving.
For activity to count as moderate or vigorous aerobic exercise, it needs to be intense enough to challenge your cardiovascular system.
The CDC describes moderate aerobic activity as activity that makes you breathe harder and raises your heart rate.
A simple way to judge it is the talk test.
The talk test
Moderate intensity: you can talk, but you would struggle to sing.
Vigorous intensity: you can usually say only a few words before needing to pause for breath.
Examples of cardiovascular exercise can include:
- brisk walking
- cycling
- swimming
- jogging
- running
- rowing
- dancing
- aerobic classes
- sustained stair climbing
The activity itself does not automatically determine whether it counts as cardio.
Intensity does.
A slow walk may be general movement for one person.
A brisk uphill walk may be moderate or even vigorous cardio for somebody else.
Read the CDC guide to measuring exercise intensity
In short: Cardio should raise your heart rate and make you breathe noticeably harder. Simply being on your feet does not automatically make an activity cardiovascular exercise.
Do 5,000 steps count as cardio?
Not automatically.
A step count tells you how much movement you accumulated.
It does not tell you how hard your cardiovascular system was working.
Imagine two people who both finish the day with 5,000 steps.
One accumulates those steps gradually by walking around the house, going to the kitchen, shopping and moving around at work.
The other completes a sustained 30-minute brisk walk that raises their heart rate and makes them breathe noticeably harder.
Both have moved.
But the second person has clearly completed a period of cardiovascular exercise.
5,000 steps are not automatically 5,000 steps of cardio
Your step count measures movement volume.
Cardiovascular exercise is defined by sustained intensity.
Daily steps are still useful.
Moving more and sitting less is beneficial even when that movement is not intense enough to count as a structured cardio workout.
But hitting 5,000, 8,000 or 10,000 steps does not automatically mean you have completed dedicated cardiovascular exercise.
In short: Steps count as cardio when some of those steps are completed at sufficient intensity to raise your heart rate and breathing. The number of steps alone cannot tell you that.
What heart rate counts as cardio?
Heart rate can provide another useful way of estimating exercise intensity.
There are several ways of calculating heart-rate zones, so your watch or fitness app may use slightly different numbers.
In a commonly used five-zone system:
Approximately 60% to 70% of estimated maximum heart rate. It should feel sustainable. Your breathing is elevated, but light conversation is usually still possible.
Approximately 70% to 80% of estimated maximum heart rate. This feels noticeably harder. Breathing becomes heavier and conversation becomes shorter.
See Cleveland Clinic's guide to the five heart-rate zones
Example for a 45-year-old
A commonly used estimate of maximum heart rate is:
For someone aged 45:
220 - 45 = approximately 175 beats per minute.
Using the common five-zone model:
- Zone 2: approximately 105 to 123 bpm
- Zone 3: approximately 123 to 140 bpm
These figures are estimates, not individual prescriptions.
The American Heart Association uses a broader classification, describing moderate activity as approximately 50% to 70% of estimated maximum heart rate and vigorous exercise as approximately 70% to 85%.
See the American Heart Association target heart-rate guide
Heart-rate targets can vary according to fitness, individual physiology, medical conditions and medications.
Some medicines can also change the normal heart-rate response to exercise.
That is why the talk test and your perceived effort are useful alongside a smartwatch or heart-rate monitor.
In short: Zone 2 and Zone 3 can provide useful reference points for cardio, but do not become obsessed with an exact number. Your breathing, effort and ability to talk are useful indicators too.
Daily movement, cardio and strength training are not the same thing
It helps to think of physical activity as three overlapping categories.
Walking around the house, commuting, shopping, taking the stairs, doing errands and generally spending less time sitting.
Sustained activity performed hard enough to raise your heart rate and make you breathe noticeably harder.
Activity that challenges your muscles against meaningful resistance.
One activity can sometimes tick more than one box.
For example, walking quickly uphill while carrying an appropriate load may challenge both your cardiovascular system and your leg muscles.
But the three categories should not automatically be treated as interchangeable.
In short: Move throughout the day, challenge your heart and lungs sometimes, and challenge your muscles regularly.
Can housework count as strength training?
Sometimes.
You do not need a dumbbell for your muscles to experience resistance.
Official NHS guidance includes several everyday activities as examples of muscle-strengthening exercise.
Carrying heavy shopping
Carrying genuinely heavy shopping bags can challenge your grip, arms, shoulders, trunk and legs.
Heavy gardening
Digging and shovelling can provide meaningful resistance and are specifically listed by both the NHS and CDC as examples of muscle-strengthening activity.
Lifting and carrying children
Repeated lifting and carrying can provide substantial resistance, particularly when the load is challenging relative to your current strength.
Moving appropriately manageable loads
Moving boxes, bags of soil and other appropriately manageable objects can challenge your muscles when the load is heavy enough to require genuine effort.
See NHS examples of muscle-strengthening activity
But not all housework counts
Dusting, making the bed, preparing food and casually walking around the house all contribute to movement.
That movement is useful.
But light activity does not necessarily challenge your muscles enough to act as strength training.
Even activities such as vacuuming may primarily be general movement for many people rather than meaningful resistance exercise.
Ask yourself one question
Is this activity actually challenging my muscles, or am I simply moving?
That is more useful than trying to decide whether a particular household chore technically qualifies as exercise.
In short: Heavy, resistance-based household activities can contribute to strength training. Ordinary light housework usually contributes more to general daily movement.
Can housework replace a strength-training programme?
For most people, not completely.
Household activity can be valuable, but it tends to be uneven.
You might regularly carry heavy shopping and challenge your grip and legs, but rarely train your chest, back or shoulders through their full range.
A planned resistance programme makes it easier to deliberately work the major muscle groups:
- legs
- hips
- back
- abdomen
- chest
- shoulders
- arms
It also makes it easier to gradually increase the challenge.
You can move from:
- 8 squats to 12 squats
- a light resistance band to a stronger band
- 3 kg dumbbells to 4 kg dumbbells
- one set to two sets
- a supported exercise to a more challenging variation
This gradual increase in challenge is one of the basic principles behind becoming stronger.
In short: Count demanding household activity as useful strength work, but a simple structured programme makes it easier to train your whole body and progress over time.
How often should you strength train on GLP-1?
You do not need to lift weights every day.
General adult physical activity guidance recommends muscle-strengthening activity involving all the major muscle groups on at least two days each week.
The CDC also recommends at least 150 minutes of moderate-intensity aerobic activity per week, or 75 minutes of vigorous activity, or an equivalent combination.
See the CDC adult physical activity guidelines
A simple full-body strength session
Works the legs and hips.
Works the chest, shoulders and arms.
Works the back and arms.
Works the legs and hips.
Works the shoulders and arms.
You do not need 15 different exercises.
A small number of movements performed consistently can provide a useful starting point.
Allow time to recover and gradually increase the challenge as the exercises become easier.
In short: Two well-planned full-body strength sessions each week can be a practical starting point for many adults.
What if your appetite or energy is low on GLP-1?
More exercise is not always better.
GLP-1 medication can substantially reduce appetite, and some people experience gastrointestinal symptoms that make eating and drinking more difficult.
If you are struggling to eat or drink enough, repeatedly feel dizzy or weak, become dehydrated or have persistent symptoms, speak with your prescribing clinician rather than trying to compensate by pushing yourself through harder workouts.
If you are new to resistance training, make it manageable.
- Start with shorter sessions.
- Use fewer exercises.
- Begin with one set rather than several.
- Use bodyweight before adding external resistance where appropriate.
- Allow sufficient recovery between sessions.
- Increase the difficulty gradually.
Nutrition matters too.
Strength training cannot completely compensate for inadequate nutrition.
That is why adequate protein, overall nutrition, hydration, resistance exercise and recovery should work together.
In short: The goal is to build strength, not exhaust yourself. Exercise, nutrition, hydration and recovery all matter.
Stop judging exercise by calories burned
One of the least useful ways to judge a strength session is by the calorie number displayed on a smartwatch.
A 30-minute resistance session may show fewer calories than a 30-minute run or hard cycle.
That does not mean the strength session was less worthwhile.
Strength training has a different job.
Its purpose is to challenge your muscles.
It can also create a post-exercise recovery demand that continues after your workout has ended.
So rather than finishing a workout and asking:
Ask:
"Did I give my muscles a reason to stay strong today?"
That is a much more useful way to think about resistance exercise while your weight is changing.
So what should exercise on GLP-1 actually look like?
You do not need an elaborate programme.
Walk, take the stairs, do errands and avoid spending unnecessary hours sitting.
Work the major muscle groups against meaningful resistance.
Include brisk walking, cycling, swimming or another activity that raises your heart rate and makes you breathe harder.
If maintaining muscle and strength during weight loss is your priority, make sure resistance training is not the first thing removed from your schedule.
Increase resistance, repetitions or exercise difficulty as your body adapts.
Protein, overall nutrition, hydration and recovery matter alongside exercise.
The key idea
You do not need perfect workouts.
You need enough resistance to challenge your muscles, enough cardiovascular activity to support your fitness and enough daily movement to keep your body active.
As your weight changes, strength should remain part of the outcome.
The bottom line
GLP-1 medication can help support substantial weight loss.
But losing weight and maintaining a strong, capable body are not exactly the same goal.
Resistance training gives your muscles a regular reason to work.
Cardio supports your heart, lungs and aerobic fitness.
Daily movement helps you spend less time sedentary.
And although these categories overlap, they are not interchangeable.
5,000 steps do not automatically equal cardio.
Cardio does not replace resistance training.
Light housework does not automatically equal strength training.
But a brisk walk that genuinely raises your heart rate can be cardio.
Carrying heavy shopping or digging in the garden can genuinely challenge your muscles.
And a challenging resistance workout can continue to increase your body's energy demands during the recovery period after the exercise has finished.
You do not need to become a bodybuilder.
The goal is simply to make sure that as your body becomes lighter, strength remains part of what you take with you.
Want a structured approach to nutrition and strength on GLP-1?
The GLP-1 Success Method™ brings nutrition, protein, strength, appetite and practical habits together in one clear 12-week programme.
Explore the GLP-1 Success Method™Frequently asked questions
Why is strength training important on GLP-1?
Significant weight loss generally involves some loss of lean tissue as well as body fat. Resistance training provides a muscular stimulus during weight loss and research suggests it can help reduce the loss of fat-free mass and improve strength. It is useful alongside adequate protein and overall nutrition.
Should I prioritise strength training or cardio on GLP-1?
Ideally include both because they do different jobs. Cardio supports your heart, lungs and aerobic fitness, while resistance training directly challenges your muscles. If your structured exercise time is very limited and maintaining muscle and strength during significant weight loss is the priority, make sure regular strength training is not the part that gets left out.
Does walking count as cardio?
It can. Walking counts as moderate aerobic exercise when you walk at an intensity that noticeably increases your heart rate and breathing. A leisurely stroll may still be useful daily movement without reaching moderate cardiovascular intensity.
Do 5,000 steps count as cardio?
Not automatically. Step count measures the amount of movement you accumulate rather than the intensity of that movement. If some of those steps come from a sustained brisk walk that raises your heart rate and breathing, that period can count as cardio.
What is Zone 2 cardio?
In a commonly used five-zone heart-rate system, Zone 2 is approximately 60% to 70% of estimated maximum heart rate. It should usually feel sustainable and light conversation should still be possible.
What is Zone 3 cardio?
Zone 3 is commonly described as approximately 70% to 80% of estimated maximum heart rate. The effort feels noticeably harder than Zone 2, breathing becomes heavier and conversation becomes more difficult.
What is the afterburn effect after strength training?
The afterburn effect is the informal term for excess post-exercise oxygen consumption, or EPOC. After demanding exercise, your body continues using additional oxygen and energy while it recovers. Resistance training and high-intensity interval exercise can produce a greater and longer post-exercise increase than moderate steady-state cardio. The effect is real but variable and should be considered a bonus rather than the main reason to strength train.
Does cardio have an afterburn effect?
Yes, it can. EPOC is not exclusive to strength training. However, the size and duration of the effect depend heavily on exercise intensity. Moderate steady-state cardio generally produces a smaller post-exercise effect than demanding resistance training or high-intensity interval exercise.
Does housework count as strength training?
Some demanding activities can. Heavy gardening, carrying heavy shopping, lifting and carrying children and other activities that make your muscles work significantly harder than usual can contribute to muscle strengthening. Routine light household tasks generally contribute more to daily movement.
How often should I strength train?
General adult physical activity guidance recommends muscle-strengthening activity involving all major muscle groups on at least two days each week. Your appropriate starting point may vary depending on your current fitness, health and exercise experience.
Do I need a gym to strength train?
No. Your muscles respond to resistance, not to the location of the workout. Bodyweight exercises, resistance bands, dumbbells, kettlebells and appropriately challenging everyday activities can all provide resistance.
References and further reading
1. Eisa N, Barood O.
Lean Mass Changes With Incretin Therapy Versus Lifestyle Intervention: A Systematic Review and Meta-Analysis of Randomised Controlled Trials.
PubMed
2. Binmahfoz A, Dighriri A, Gray C, Gray ST.
Effect of resistance exercise on body composition, muscle strength and cardiometabolic health during dietary weight loss in people living with overweight or obesity: a systematic review and meta-analysis.
PubMed
3. Centers for Disease Control and Prevention.
What Counts as Physical Activity for Adults?
CDC
4. Centers for Disease Control and Prevention.
How to Measure Physical Activity Intensity.
CDC
5. Centers for Disease Control and Prevention.
Adult Activity: An Overview.
CDC
6. NHS.
Physical activity guidelines for adults aged 19 to 64.
NHS
7. American Heart Association.
Target Heart Rates Chart.
American Heart Association
8. Cleveland Clinic.
What Are the Five Heart Rate Zones?
Cleveland Clinic
9. Greer BK, Sirithienthad P, Moffatt RJ, Marcello RT, Panton LB.
EPOC Comparison Between Isocaloric Bouts of Steady-State Aerobic, Intermittent Aerobic, and Resistance Training.
PubMed
10. Evoren Health.
How to Protect Muscle While Losing Weight on GLP-1.
Evoren Health
This article is for general educational purposes and is not a substitute for individual medical, nutritional or exercise advice. Exercise needs vary according to your health, fitness, medications, medical history and current nutritional intake. Speak with your prescribing clinician or another appropriate healthcare professional before beginning a new exercise programme if you have a medical condition, are new to exercise, experience dizziness or weakness, have difficulty eating or drinking enough, or are unsure what level of activity is appropriate for you. Evoren does not prescribe, stop or adjust GLP-1 medication.