Six months into GLP-1, I had lost 19 pounds. I felt good about the progress. Then I had a body composition scan done at my provider’s office, and the results were more complicated than I expected.
About a third of what I’d lost was muscle, not fat.
My provider wasn’t alarmed. She said this was common on GLP-1 when resistance training wasn’t part of the picture. The fix was straightforward: add strength training. But the how — when my energy was lower than usual, when I had no gym membership, when I’d never done structured lifting before — took some figuring out.
Here’s what I learned.
Why Muscle Loss Happens on GLP-1
GLP-1 medications work by suppressing appetite. You eat less. Your body draws on stored energy to make up the difference, which is the whole point.
The problem is that the body doesn’t pull exclusively from fat stores. When you’re in a significant caloric deficit — which most people on GLP-1 are — your body will also break down muscle tissue for energy, particularly if you’re not sending it a clear signal to preserve that muscle.
Resistance training is that signal. When you challenge a muscle with load or resistance, your body gets the message that it needs that muscle and prioritizes maintaining it. Without that signal, the muscle is fair game.
This matters beyond aesthetics. Muscle mass affects metabolic rate, insulin sensitivity, joint stability, and long-term mobility. Losing significant muscle while losing weight is not a neutral trade. It can make it harder to maintain weight loss after you stop the medication, and it affects how you feel and function well beyond the number on the scale.
What Strength Training on GLP-1 Actually Looks Like
It does not look like what you see in gym advertising.
When your caloric intake is reduced and your energy is lower than usual, high-volume or high-intensity lifting will leave you depleted and unable to recover. The goal is not to maximize training load. The goal is to give your muscles enough stimulus to maintain themselves.
Two to three sessions per week of 30 to 40 minutes each is enough. Research on muscle retention during caloric restriction consistently shows that frequency and consistency matter more than session volume. Two solid sessions per week beats one long, exhausting one.
A Basic Home Strength Routine
You do not need a gym. The following covers the major muscle groups with no equipment required.
Lower body: Squats, reverse lunges, glute bridges, step-ups (if you have stairs or a sturdy chair)
Upper body push: Pushups (modify on your knees if needed), pike pushups for shoulder emphasis
Upper body pull: Resistance band rows (a $10 band is enough), doorframe rows
Core: Dead bug, bird dog, plank variations — these protect the low back and build the functional strength that makes everything else easier
A session might look like: three rounds of squats, pushups, resistance band rows, and a plank hold. Twenty-five minutes. That’s a complete strength session.
If you want a structured program rather than figuring out your own routine, the home workout apps I cover here are worth looking at, particularly for men over 40 who want a 28-day program that requires no equipment.
Progressive Overload: The One Principle That Matters
Strength training only works if it gets progressively harder over time. Your body adapts to a given stimulus. Once it adapts, that stimulus stops driving muscle retention.
Progressive overload doesn’t mean adding weight every session. It means doing slightly more over time: one more rep, a slightly more difficult variation, a shorter rest period. Keep a basic log — even just notes on your phone — so you can see what you did last session and push a little further this one.
Creatine: The Supplement That Supports This
Creatine is the most research-backed supplement for supporting strength and muscle retention. It helps muscles produce energy during training and supports recovery between sessions.
I added creatine about three months into GLP-1. My provider suggested it specifically because of the muscle retention concern. The evidence for it is strong, the safety record over decades of use is solid, and it doesn’t require cycling or loading.
I take Arq8 FullDissolve nano-creatine daily, regardless of whether I train that day. It dissolves completely, absorbs faster than standard creatine powder, and comes in a form that’s easy to take even when appetite is low. You can find it here.
Affiliate link — I may earn a commission at no extra cost to you.
How Long Before You See Results
Muscle retention is not the same as muscle gain. When you start strength training on GLP-1, the first goal is to stop losing muscle, not to add it.
You may not see visible changes for six to eight weeks. What you will notice earlier: tasks that felt harder feel easier, energy during sessions improves, and the fatigue that comes with caloric restriction becomes more manageable. Those are signs the training is working even before the mirror confirms it.
Visible muscle tone and strength gains come later, typically after the body has adapted to the training stimulus and caloric intake has stabilized. If you’re still in the active weight loss phase, muscle preservation is the win. Building on top of it comes after.
The Bottom Line
Two strength sessions a week, done consistently, is enough to protect the muscle you risk losing on GLP-1. You don’t need a gym, heavy weights, or an hour of your day. You need a basic routine, a resistance band, and the consistency to show up twice a week.
Add creatine. Eat enough protein. Walk daily. Those three things alongside strength training cover the full picture.