Strength Benchmarks on a GLP-1: How to Tell If You’re Holding On

Why test function rather than composition

Composition tells you what changed inside; function tells you what changed in your life. Function is also cheaper to measure — no scan, no appointment, no error bar of two kilograms — and it responds to training in a way you can feel within weeks.

There’s a more interesting reason too. Lean mass and strength are not the same thing and they don’t always move together, which is the subject of the losing-weight-and-getting-weaker guide. A scan showing lost lean mass is not the same as being weaker, and only one of those is something you notice.

The three tests worth doing

Grip strength is the classic quick proxy: cheap, quick, and used in clinical research as a marker of whole-body strength. The grip-strength guide covers how to test it and what the published cut-points do and don’t mean. The sit-to-stand test measures leg strength and needs nothing but a chair and a timer — see the sit-to-stand guide.

The third isn’t a test so much as paying attention: stairs, carrying, getting up off the floor. The everyday-strength guide argues these tell you more than any single measurement, because they’re the thing the measurement is a proxy for.

What published cut-points are — and aren’t

You’ll find thresholds quoted for these tests. A European expert consensus, for instance, gives low grip strength as roughly 27 kg for men and 16 kg for women. Those are useful reference points and they exist for a reason.

But read them the way clinicians do: as screening thresholds that prompt further assessment, not a diagnosis you can hand yourself from your sofa. A number below a cut-point is a reason to mention it to your healthcare provider, not a conclusion. We won’t tell you what a result means about your health, because a web page genuinely cannot know.

What the research does and doesn’t know

Be wary of confident claims in either direction here. A 2026 review of how these medications affect strength — as distinct from muscle size — describes the research as limited and the findings as pointing different ways: shorter trials in adults with obesity reported grip strength holding up despite lean-tissue reductions, while some longer research in older adults with type 2 diabetes reported reductions. Nobody can currently tell you what a GLP-1 does to your strength specifically.

There is also a broader finding worth carrying: in a study of nearly 1,900 older adults, leg strength declined roughly three times faster than leg muscle mass. Strength and size are simply not the same measurement, which is the case for testing strength directly rather than inferring it.

Your own baseline is the real benchmark

Here’s the framing that makes all of this useful. Comparing yourself to a population table tells you where you sit among strangers. Comparing yourself to yourself, three months ago, tells you whether what you’re doing is working — which is the question you actually have.

So test early, before much has changed, then repeat under identical conditions. The at-home testing routine sets that up in a way you’ll actually repeat, and the track-strength-not-the-scale guide covers the training log that fills the gaps in between.

Common questions

Keep reading