Exercises to Avoid With Low Bone Density on a GLP-1
4 min read · Updated
The short answer
There is no universal list, and anyone handing you one without knowing your bones is guessing. The movements usually named — deep end-range spinal bending, twisting under load, and high-impact jumping — are named out of caution about the spine, and how much they apply to you depends on whether your bone density has actually been measured and what it showed. What the research has tested is close to the opposite of restriction: in a trial in postmenopausal women with low bone mass, twice-weekly supervised resistance and impact training was associated with improved spine and hip bone density and was well tolerated. So the useful order is get assessed, then load under guidance — and the assessment part belongs with your healthcare provider.
People arrive at this question expecting a list of forbidden moves. The honest answer is that the list is shorter, vaguer, and more personal than the internet suggests — here’s how to think about it instead.
Why there’s no universal avoid-list
The reason nobody can hand you a clean list is that ‘low bone density’ isn’t one state. It ranges from slightly below average to genuinely fragile, it differs between your hip and your spine, and it sits alongside your age, your history, and whether you’ve ever had a fracture. A restriction that’s sensible for one person on that range is pointless caution for another.
Which means the honest first step isn’t choosing exercises at all — it’s finding out where you stand. If you haven’t been assessed, you’re guessing about the input, and no exercise list can fix that. The who’s-most-at-risk guide can help you judge whether the conversation is worth having soon.
The movements that usually get named — and the caveat
The ones that come up most are deep end-range spinal flexion (think loaded sit-ups, crunches, or bending hard at the waist to reach the floor), forceful twisting of the spine under load, and high-impact work like jumping or running for people whose bones are known to be fragile. The logic behind each is the same: they concentrate force on the spine or load it in a position where it’s least able to handle it.
The caveat is worth stating plainly. Those cautions are about the group of people with meaningfully low bone density, not about everyone losing weight on a GLP-1, and they’re framed as prudence rather than as proven cause of harm in ordinary training. Treating them as universal rules leads people to avoid strength training altogether, which is the genuinely bad outcome here.
What the research actually tested was loading
This is the part the ‘avoid’ framing buries. In a randomized trial in postmenopausal women with low bone mass, twice-weekly supervised high-intensity resistance and impact training was associated with improved spine and hip bone density and was well tolerated. Those women were in the higher-risk group, and they trained hard — supervised, and with their technique coached.
The reading isn’t ‘so anyone can lift heavy’. It’s that the evidence base for bone points toward loading rather than away from it, and that supervision and technique are what make loading appropriate. That’s a very different instruction from a list of banned movements — and it lines up with the weight-bearing exercise guide, which is the do side of this same question.
The order of operations
Assess, then load. If bone is a real concern for you — you’ve been told your density is low, you’ve had a fracture, or several of the named risk factors describe you — the sequence is to get that clarified with your healthcare provider, ask specifically which movements they’d have you modify, and ideally get a session or two with a physiotherapist who can watch you do them. That’s a personal call with your own numbers behind it, which is exactly what a web page can’t give you.
Until then, default to the safe middle: controlled resistance work through a comfortable range, no loaded end-range spinal bending, and no jumping added on impulse. Steady, well-formed, gradually progressed work is what the trials were built on — and it’s the same training that protects the muscle you’re working to keep.
The thing that makes loading appropriate isn’t a list of banned moves — it’s technique and sensible progression. Mira coaches each session through your phone and scores your form as you go, so you build gradually through a range you can control.
Build my planCommon questions
What exercises should I avoid with low bone density?+
There’s no list that applies to everyone, because ‘low bone density’ spans everything from slightly below average to genuinely fragile. The movements usually named are deep end-range spinal bending (loaded crunches, bending hard at the waist), forceful twisting under load, and high-impact jumping for people known to be fragile. Whether any of them apply to you depends on your own measurements — that’s a question for your healthcare provider, ideally with a physiotherapist to review your technique.
Is it safe to lift weights if my bone density is low?+
Resistance training is generally the thing the research points toward, not away from — in a trial in postmenopausal women with low bone mass, twice-weekly supervised resistance and impact training was associated with improved spine and hip bone density and was well tolerated. The important words are supervised and progressive. Start light, build gradually, keep your spine in a comfortable range, and get the specifics cleared with your provider if bone is a known concern for you.
Should I avoid impact exercise on a GLP-1?+
Not by default. Losing weight on a GLP-1 isn’t itself a reason to rule out impact — the caution applies to people whose bone density is known to be low, and most people have never had it measured. The sensible approach is to not add jumping on impulse, build a base of controlled resistance work first, and ask your provider about higher-impact training if you’re older, postmenopausal, slender, or otherwise higher-risk.
Keep reading
Bone Health on a GLP-1
Losing weight fast can cost bone as well as fat. How weight-bearing training, protein, calcium, and vitamin D support bone health on a GLP-1.
Weight-Bearing Exercise for Bone Health on a GLP-1
Which movements actually load bone — weight-bearing and resistance work — and how to start safely on a GLP-1 without overdoing it.
Who’s Most at Risk of Bone Loss on a GLP-1?
Older age, menopause, a slender frame, rapid loss, and low intake raise the odds of bone loss on a GLP-1 — and who should ask about screening.
How to Protect Your Bones While Losing Weight on a GLP-1
A practical checklist for bones on a GLP-1: keep resistance training in, get enough protein, calcium, and vitamin D, and ask your provider about screening.
How Much Bone Do You Lose on a GLP-1?
The actual numbers from weight-loss research — about 1.7% at the femoral neck — what they don’t cover, and why rate matters more than the total.
A Gentle Strength Workout Over 50 on a GLP-1
A joint-friendly, chair-supported first strength session for an older beginner on a GLP-1 — slow, safe, and doable at home in about 20 minutes.