Why your prescriber keeps saying 'do resistance training'

If you're on a GLP-1, you've heard it: 'Make sure you do resistance training.' It lands like homework with no instructions. Here's what your prescriber actually means — and why they keep saying it.

Any significant calorie deficit pulls from both fat and muscle. GLP-1 medications produce fast, sustained deficits — that's the point — but the speed raises the stakes. Without strength training, research suggests 25–39% of the weight you lose can be muscle, not fat.

Why muscle is the thing worth keeping

That muscle is not just biceps. It's what sets your resting metabolism, stabilizes your joints, keeps your blood-sugar handling sharp, and decides how strong you feel carrying groceries at 70.

Lose it, and two things happen: the weight comes back easier later (less muscle means a slower metabolism), and you arrive at your goal weight weaker than you started. Neither outcome is inevitable — but the medication alone doesn't prevent them.

What 'resistance training' means in practice

Not bodybuilding. Not two-hour gym sessions. The research-backed counterweight is unglamorous: strength training that gets gradually heavier, plus enough protein. Two to four short full-body workouts a week — 30 to 50 minutes — is enough to send the keep-the-muscle signal.

That's the entire idea behind GLP-1 Strength: the training your prescriber keeps telling you to do, built around the reality of the medication — low-energy days, dose-increase weeks, and a smaller appetite included.