Training on GLP-1: A Strength and Cardio Guide That Protects Muscle

The muscle loss problem is real

Across the major GLP-1 trials, roughly 25–40% of total weight lost was lean body mass when participants did not train. That's not the medication's fault — it's what happens to anyone in a sustained calorie deficit who doesn't give the body a reason to keep its muscle.

The good news: this is entirely preventable. Resistance training plus adequate protein closes most of the gap.

The minimum effective dose of lifting

You do not need a bodybuilding split. You need three sessions a week that hit every major movement pattern with real load.

• Squat or leg press: 3 sets of 6–10 reps.
• Hinge (deadlift, RDL, or hip thrust): 3 sets of 6–10 reps.
• Horizontal push (bench, dumbbell press, or push-up progression): 3 sets of 8–12 reps.
• Horizontal pull (row variation): 3 sets of 8–12 reps.
• Vertical pull (lat pulldown or assisted pull-up): 3 sets of 8–12 reps.

Protein when you don't feel like eating

GLP-1s suppress appetite. That's the point. But it also means hitting protein takes intent.

Target: 1.6 g of protein per kg of bodyweight per day, minimum. For a 90 kg person, that's ~145 g. Split across 3–4 feedings so you actually digest it.

Front-load it. Most people on GLP-1s can eat a real breakfast and find dinner aversive. A 40g protein breakfast removes most of the deficit before the appetite suppression kicks in.

Cardio: less than you think

Two to three short Zone 2 sessions per week (30–45 min, conversational pace) is plenty. The medication is already creating the deficit. Excessive cardio just deepens the hole and eats your recovery.

Walk daily. 8–10k steps. That's where the real low-cost cardiovascular and metabolic returns are.

What to track in Arc

You don't need a complicated app. You need three signals:

• Weekly photo (same conditions) — to see body composition, not just weight.
• Top set of each lift, each week — if it's going up or holding, you're keeping muscle.
• One daily note on energy, hunger, and sleep — the leading indicators that something needs adjusting.

If you do nothing else

Lift three times a week. Eat 1.6 g/kg of protein. Walk daily. Photograph weekly. Everything else is optimization. Most people who fail on GLP-1s don't fail at the medication — they fail at the muscle defense, and they only find out a year in when the scale stalls and the body in the mirror looks softer than expected. Start now.