Guide · Updated November 2026

The Best Workout Routine for GLP-1 Users Who Want to Keep Muscle

The best workout routine for GLP-1 users centers on heavy resistance training 3 to 4 days per week, enough daily protein, and limited steady-state cardio. In the SURMOUNT-1 body composition substudy, about 25% of tirzepatide weight loss came from lean mass.

My first DEXA scan on Mounjaro came back three months after I started 2.5 mg. I had lost 22 pounds. Of those 22, about 7 pounds were lean mass. That is a 32% lean mass share, higher than the roughly 25% average in the SURMOUNT-1 body composition substudy. The scary part is how little I felt it happen. My clothes fit better. My lifts were the same-ish. The scale was doing what I wanted. The scan told a different story.

This guide is the training protocol I rebuilt after that scan, and what the research says about the best workout routine for GLP-1 users. The drugs in question are tirzepatide (sold as Mounjaro for diabetes and Zepbound for weight loss) and semaglutide (Ozempic for diabetes, Wegovy for weight loss). Both are GLP-1 receptor agonists. They slow gastric emptying, reduce appetite at the hypothalamus, and lower blood glucose. They do not preserve muscle. That job is yours, and training is how you do it.

Why GLP-1 users lose muscle without a plan

The headline numbers from the SURMOUNT-1 trial (NEJM, July 2022) look great. Participants on 15 mg tirzepatide lost 20.9% of body weight on average over 72 weeks (NEJM abstract). The DEXA substudy added the split. Fat mass dropped 33.9%. Lean mass dropped 10.9%, and lean mass made up about 25% of the weight lost (Look et al., Diabetes Obesity and Metabolism, 2025). Lean mass includes muscle, organs and water, and losing 10.9% of it is a real cost.

Semaglutide looks worse on this metric. In the STEP 1 DEXA substudy, lean mass made up about 39% of total weight lost (Wilding et al., NEJM, 2021). These are separate trials, so the gap is a rough comparison. In SURMOUNT-1, the placebo group had a similar 75/25 fat-to-lean split, which suggests the lean loss comes with weight loss in general, not the drug specifically.

Three things drive the muscle loss:

• Caloric deficit. You are eating much less than before. Muscle is metabolically expensive. The body trims it.
• Low protein intake. Many GLP-1 users I talk to hit 50 to 80 grams per day, often well below the targets below.
• No training stimulus. If you do not signal to the muscle that it is needed, the body reads it as overhead and cuts it.

You control two of those three. That is the whole game.

The 4-pillar framework

The best workout routine for GLP-1 users is not one routine. It is four rules that shape any routine you pick.

1. Resistance training is the anchor. 3 to 4 sessions per week, hitting every major muscle group twice.
2. Heavy loads, moderate reps. Most working sets in the 5 to 10 rep range. Train close to failure.
3. Cardio is a side dish, not the main meal. 1 to 2 short sessions per week. Zone 2 or intervals, not slow-burn hour-long treadmill blocks.
4. Eat enough protein to justify the training. A 2025 advisory proposed 1.2 to 1.6 g per kilogram per day during active weight loss.

Drop any one of these and the other three will not save you. I tried running 4 days a week and lifting twice during month 2. My next scan showed another 3 pounds of lean mass gone. That is one person, but it pushed me back to lifting first.

Training split: the 3-day and 4-day options

Pick one of these. Run it for at least 8 weeks before changing.

3-day full body (for people with less time)

• Monday: Squat pattern, horizontal push, horizontal pull, core
• Wednesday: Hinge pattern, vertical push, vertical pull, core
• Friday: Lunge pattern, horizontal push, horizontal pull, carries

Each session: 5 to 6 exercises, 3 sets of 6 to 10 reps. 45 to 60 minutes total.

4-day upper/lower (my current split)

• Monday: Lower A (squat focus)
• Tuesday: Upper A (horizontal push/pull)
• Thursday: Lower B (hinge focus)
• Friday: Upper B (vertical push/pull)

Each session: 5 to 7 exercises, 3 to 4 sets of 5 to 10 reps. 60 to 75 minutes.

I moved from 3-day full body to 4-day upper/lower at month 4 when my sessions started running long. The 4-day split lets you hit each lift with more volume and fresher. If you are new to lifting, start with 3-day full body. You will progress faster.

More detail on splits and progression is in the GLP-1 Muscle Preservation Protocol, which breaks down the science of why heavy lifting beats circuit training for lean mass retention on these drugs.

Sample weekly routine (4-day upper/lower)

This is what I run now, month 14 on Mounjaro at 10 mg.

Monday, Lower A

• Back squat: 4 x 5
• Romanian deadlift: 3 x 8
• Walking lunge: 3 x 10 per leg
• Leg curl: 3 x 10
• Plank: 3 x 45 seconds

Tuesday, Upper A

• Bench press: 4 x 6
• Chest-supported row: 3 x 8
• Dumbbell incline press: 3 x 10
• Lat pulldown: 3 x 10
• Face pull: 3 x 15

Thursday, Lower B

• Deadlift: 4 x 5
• Front squat: 3 x 6
• Bulgarian split squat: 3 x 8 per leg
• Leg extension: 3 x 10
• Farmer carry: 3 x 40 meters

Friday, Upper B

• Overhead press: 4 x 6
• Pull-up (weighted if possible): 3 x 6 to 8
• Dumbbell bench: 3 x 10
• Cable row: 3 x 10
• Lateral raise: 3 x 12

Saturday, optional cardio

• Zone 2 bike or brisk incline walk, 30 to 40 minutes

That is the whole week. Five to six hours of training. Nothing fancy.

Comparison: workout styles for GLP-1 users

This table is my judgment, not trial data. The research support is strongest for resistance training. A meta-analysis of trials in older adults with obesity found resistance training during calorie restriction prevented most of the lean mass loss seen with diet alone (Sardeli et al., 2018). Everything else either supports it or competes with it for recovery.

Progressive overload on reduced calories

Here is where GLP-1 training differs from a normal cutting phase. Your calories are low. Your recovery is slower. Progress looks different.

What progressive overload means now:

• Adding 2.5 to 5 pounds to the bar every 2 to 3 weeks, not every week
• Getting one extra rep at the same weight
• Improving bar speed or control at the same weight and reps
• Completing all prescribed sets when last session you missed the final one

What it does not mean:

• Hitting personal records every session
• Grinding to failure on every set
• Adding volume to compensate for slower strength gains

I kept a training log from day one. Month 1, my squat was 245 for 5. Month 14, it is 265 for 5. That is a 20-pound gain on a 22% body weight cut. On paper it looks like stagnation. For someone in a deep caloric deficit, it is a win. My DEXA shows I held lean mass from month 6 forward. The numbers move slower, but they move.

Cardio rules for GLP-1 users

Cardio on a GLP-1 is easy to overdo. It feels productive and the scale rewards it, but it does not protect lean mass the way lifting does.

Do:

• 1 to 2 short sessions per week, 20 to 40 minutes
• Zone 2 (conversational pace) or short HIIT
• Incline walking if joints are an issue
• Active recovery walks most days (10,000 steps is fine, not mandatory)

Do not:

• Long steady-state runs over 45 minutes on a GLP-1 deficit
• More than 3 cardio sessions per week
• Cardio on the same day as lifting, back-to-back, if you can split them

The GLP-1 and Exercise: Build Muscle on GLP-1s guide goes deeper on the cardio trade-off and why most GLP-1 influencers get this wrong. The short version is that cardio is good for your heart, but it should not crowd out lifting or recovery.

Nutrition that actually supports the training

Training without eating enough is decorative. You will feel like you did something. Your body will still cut muscle. The non-negotiables:

Protein target: I aim for 0.8 to 1.0 grams per pound of goal body weight. That is above the 1.2 to 1.6 g per kilogram per day a 2025 joint advisory proposed during active weight loss, and the same advisory said prolonged intake at or above 2 g per kilogram should be avoided (advisory). For a 170-pound goal weight (77 kg), the advisory range works out to about 93 to 123 g per day. If you have kidney disease, set your target with your clinician. Any target is hard on a GLP-1. Appetite is flat. Meat feels heavy. The fix is front-loading protein at breakfast and using whey isolate shakes as a tool, not a treat. Full breakdown in How Much Protein You Need on a GLP-1.

Calories: Do not voluntarily stack deeper deficits on top of what the drug already creates. If you are losing weight very fast, talk to your prescriber about whether you are eating enough.

Creatine: The International Society of Sports Nutrition calls creatine monohydrate the most effective supplement for lean mass during training and lists 3 to 5 g per day for maintenance. It advises people with kidney disease to consult a physician first (ISSN). Ask your prescriber before starting. I cover the GLP-1 specifics in Creatine on Ozempic and Mounjaro.

Timing: I get 30 to 40 g of protein within 90 minutes of training. Total daily protein matters more than timing, but this is an easy way to hit the daily number.

My typical training-day food log is in What I Eat in a Day on Mounjaro. Appetite suppression is real and it is what makes protein the hardest nutrient to hit.

Recovery: the underrated variable

A GLP-1 deficit shortens your recovery budget. A session that would have felt like a 6 off the drug feels like an 8 on it. That is not weakness. That is reduced glycogen, reduced calorie input, and sometimes reduced sleep from side effects.

Signs you are under-recovering:

• Lifts regressing week over week
• Elevated resting heart rate 5+ bpm above baseline
• Poor sleep, especially early waking
• Training feels flat or dreadful for more than 2 sessions in a row

The fix is usually simple. Take an extra rest day. Eat 200 more calories, mostly carbs, on training days. Sleep 30 more minutes. Cut a cardio session. Do not add more training volume to fix a recovery problem.

The mistakes I see most often

These are the patterns I see on Reddit and in DMs that wreck GLP-1 body composition outcomes.

Mistake 1: Treating GLP-1s as a substitute for training. The drug drops weight. It does not build or protect muscle. A scale dropping fast is not progress if a large share of it is lean mass.

Mistake 2: Switching to high-rep “toning” workouts. Light weights for 15 to 20 reps feel appropriate for the lower energy of a GLP-1, but they do not preserve lean mass well. Heavy and short beats light and long.

Mistake 3: Running marathons on 1,200 calories. I watched a friend do exactly this. She lost 60 pounds on Wegovy in 10 months. She also lost most of her glutes and hamstrings. Her follow-up DEXA was brutal.

Mistake 4: Ignoring the scale entirely. The opposite trap. If you are losing weight very fast week after week, raise it with your prescriber. A DEXA every few months shows where the weight is coming from. My process for reading one is in DEXA Scan After 6 Months on Mounjaro.

Mistake 5: Training hungover on side effects. First 2 to 3 days after a dose is often the worst for nausea. If you train those days, scale intensity back 20 to 30%. Do not try to hit a PR on a day you can barely keep water down. More on managing this in How to Manage Nausea on Mounjaro.

What changes in maintenance

When you hit goal weight or move to a maintenance dose, training shifts. Calories come up. Recovery gets easier. You can add volume, not just hold it.

In maintenance I added a 5th session (arms and accessories). I also added a second cardio day. The reason you could not do this during active loss is the same reason you can now: calorie availability. More fuel, more training. My current split and maintenance adjustments are in the GLP-1 Maintenance Guide.

Equipment and gym choices

You do not need a fancy gym. You do need:

• A barbell and plates, or substantial dumbbells up to at least 60 pounds
• A rack or safety setup for squats and presses
• A pull-up bar
• A cable machine or bands for rowing and face pulls

A Planet Fitness membership will work for most of this. The one exception is squatting, where the Smith machines are a poor substitute. If you can only go one direction, get access to a real squat rack somewhere. Garage gyms, small commercial gyms, and YMCAs usually have them.

Bottom line

The best workout routine for GLP-1 users is 3 to 4 days of heavy resistance training, 1 to 2 short cardio sessions, and a daily protein target you set with your clinician. Lift heavy, eat enough protein, keep cardio modest, and do not chase the fastest possible scale drop. That is the protocol that held my lean mass flat from month 6 through month 14 on Mounjaro. It will not optimize for the fastest scale drop. It will optimize for the body you actually want at the end.

If you want to model your own lean mass trajectory, the Body Composition Calculator estimates fat vs lean mass changes based on your weight loss rate. Pair it with the GLP-1 Body Composition Guide for the full framework.

FAQ

Can I keep all my muscle on a GLP-1?

Probably not all of it. In the trial DEXA substudies, lean mass fell about 10.9% on tirzepatide and 9.7% on semaglutide on average. With heavy resistance training, adequate protein, and moderate cardio, I held my lean mass roughly flat from month 6 to month 14. My total lean mass is about 4 pounds below where I started, against 68 pounds of weight loss.

How many days per week should I lift on Ozempic or Mounjaro?

The trials in the meta-analysis above used three sessions a week. I do four. Five or more days was too much for my recovery on a GLP-1. Pick a split you can run consistently for 8 weeks without missing more than one session.

Should I do cardio or lift first?

If you do them on the same day, I lift first so the heavy sets get my best effort. Better solution: put cardio on a different day or at the opposite end of the day from your lifting session.

Is HIIT bad on a GLP-1?

No. One short HIIT session per week (15 to 20 minutes) is a reasonable addition for heart health and calorie flexibility. The issue is not HIIT itself, it is stacking 3 to 4 HIIT sessions on top of lifting and a deep caloric deficit. Your recovery budget cannot cover that.

What if I have never lifted weights before?

Start with the 3-day full body split at the weights you can control with good form. Do not load until you can complete every set with clean reps. A month of light sets beats a week of heavy sets with a back tweak that sidelines you. If you can afford it, 4 to 6 sessions with a trainer to learn the squat, deadlift, bench, and overhead press pays back forever.

Do I need supplements beyond protein?

Creatine has the strongest evidence for lean mass during training. Vitamin D makes sense if a blood test shows you are low, at the dose your clinician sets. Check any supplement with your prescriber, especially if you have kidney disease. Everything else is marginal. The full list of what is actually worth taking is in Best Supplements on GLP-1s (DEXA Tested).

Related

Guides:

• GLP-1 Body Composition Guide · GLP-1 Muscle Preservation Protocol · Protein Intake on GLP-1

Provider Reviews: Ro · Hims · MEDVi

Compare: All Providers · Best GLP-1 Programs · All Guides

What we checked

This AI-assisted public-source desk check reviewed the SURMOUNT-1 and STEP 1 papers, the SURMOUNT-1 body composition analysis, a resistance training meta-analysis, a 2025 protein advisory and the ISSN creatine position stand on November 4, 2026. This is not a clinical review and it is not medical advice. Prices and policies change, so confirm them with the provider or your prescriber before you act.