Bone density: small gains, and the site decides the answer
The Cochrane review of exercise for preventing and treating osteoporosis in postmenopausal women pooled 43 randomized trials and 4,320 participants. Its searches ran to December 2010, so it is old and should be read as such, but its site-specific finding has held up in structure.
Quoted from the review: the most effective type of exercise intervention on bone mineral density for the neck of femur appears to be non-weight bearing high force exercise such as progressive resistance strength training for the lower limbs (mean difference 1.03, 95% CI 0.24 to 1.82), while the most effective intervention for bone mineral density at the spine was combination exercise programs (mean difference 3.22, 95% CI 1.80 to 4.64). Those mean differences are percentage change from baseline, and the review's own conclusion calls the effect relatively small, statistically significant, but possibly important.
A network meta-analysis published in the Journal of Sport and Health Science in January 2026 brought this up to date, pooling 74 randomized trials and 5,331 participants with searches to June 2025 and a minimum intervention length of 24 weeks. It found mind-body exercise combined with resistance training most effective at the lumbar spine, femoral neck, Ward's triangle and total body, and impact exercise ranked highest at the total hip and trochanter. Mind-body exercise, in that paper's own definition, means activities integrating movement, mental focus and breath control, such as Tai Chi, yoga and Pilates.
Its other finding is more actionable than the ranking: interventions lasting 52 weeks or more produced more consistent and sustained improvements than shorter ones. That comes from a subgroup analysis and a meta-regression across trials, not from a trial that randomized women to short versus long programs, so treat it as a strong hint rather than a demonstrated dose response.
How hard, specifically
The LIFTMOR trial is the reason it is possible to name an actual protocol rather than gesture at intensity. Postmenopausal women with low bone mass were randomized to eight months of twice-weekly, 30-minute supervised high-intensity resistance and impact training, five sets of five repetitions above 85 percent of one-repetition maximum, against a home-based low-intensity program. The training arm improved lumbar spine and femoral neck bone density, femoral neck cortical thickness, height and every functional performance measure relative to the control.
The safety result is the part that contradicts received wisdom. In the trial's own words, contrary to current opinion, high-intensity resistance and impact training was efficacious and induced no adverse events under highly supervised conditions in a sample of otherwise healthy postmenopausal women with low to very low bone mass. Compliance was 92 percent in the training arm, and the single adverse event was a minor lower back spasm.
A companion paper examined vertebral fractures directly, using lateral thoracolumbar DXA scans and the semiquantitative Genant method, because concerns about the safety of heavy lifting in this group persisted despite no clinical signs during the trial. It found no changes in vertebral fracture classification in the training group, and a single new wedge deformity in the control group. It also found a reduction in standing thoracic kyphosis in the training arm compared with control (-6.7 versus -1.6 degrees, p=0.031). Its conclusion: supervised high-intensity training was not associated with an increased risk of vertebral fracture in postmenopausal women with low bone mass.
Two conditions in that sentence do real work and should not be dropped: under highly supervised conditions, and in otherwise healthy postmenopausal women. This is not an argument for loading a heavy barbell unsupervised after an osteoporosis diagnosis.
The outcome that actually matters: fractures and falls
Bone density is a surrogate. Two bodies of evidence speak to the real endpoint, and they point in the same direction with very different certainty.
A systematic review and meta-analysis in Osteoporosis International pooled 11 studies covering 9,715 participant-years in exercise groups and 9,592 in controls, in cohorts averaging over 50 years old. It found a favourable effect on major osteoporotic fractures, RR 0.75 (95% CI 0.54 to 0.94, p=0.006), which the authors summarize as a 23 percent reduction in incidence. Their honest conclusion about protocols is worth reproducing: diverging study and exercise characteristics, along with the close interaction of exercise parameters, prevented the derivation of reliable recommendations for exercise protocols for fracture reductions. One of the 11 studies was non-randomized, and some controls were active.
Then falls, where the evidence is strongest in the entire field. Cochrane's review of exercise for preventing falls in community-dwelling people aged 60 and over pooled 108 randomized trials and 23,407 participants.
| Finding | Effect | Certainty |
|---|---|---|
| Exercise reduces the rate of falls | 23 percent (RaR 0.77, 95% CI 0.71 to 0.83) | High |
| Exercise reduces the number of people experiencing one or more falls | 15 percent (RR 0.85, 95% CI 0.81 to 0.89) | High |
| Balance and functional exercises reduce the rate of falls | 24 percent (RaR 0.76, 95% CI 0.70 to 0.81) | High |
| Multiple exercise types, usually balance and functional plus resistance | 34 percent (RaR 0.66, 95% CI 0.50 to 0.88) | Moderate |
| Tai Chi reduces the rate of falls | 19 percent (RaR 0.81, 95% CI 0.67 to 0.99) | Low |
| Exercise reduces people experiencing fall-related fractures | RR 0.73 (95% CI 0.56 to 0.95) | Low |
What a complete program contains
Reading the evidence together rather than one paper at a time gives a program with three parts, each justified by a different source.
- Progressive resistance training, loaded and heavy enough to progress. This is what moves femoral neck density in the Cochrane bone review and what LIFTMOR tested at 5 sets of 5 above 85 percent of one-rep max. Start supervised, particularly if you already have low bone mass.
- Impact work, matched to your capacity. Ranked highest at the total hip and trochanter in the 2026 network meta-analysis. That can mean hopping and jumping for someone robust, and brisk walking with directional changes and stair work for someone who is not.
- Balance and functional exercise, which is the part people skip. It carries the only high-certainty evidence on this page, and it is what the fall-prevention benefit rests on.
- A year, not eight weeks. The 2026 analysis found interventions of 52 weeks or more produced more consistent improvements.
Exercise and Sports Science Australia's position statement, published in 2017 and now nine years old, aligns with this: bone responds positively to impact activities and high-intensity progressive resistance training, and optimising muscle strength, balance and mobility minimises the risk of falls and thereby fracture. It also notes that loaded spine flexion is not recommended. Adequate calcium and vitamin D underpin any of it, and our guide to who actually needs vitamin D supplements covers that side. Our guide to strength training after 40 covers the resistance component in more detail, and protein intake the nutrition that supports it.
Frequently asked questions
Is walking enough to prevent osteoporosis?
Probably not on its own. Walking is a low-impact activity, and the bone-density evidence favors progressive resistance and impact loading. Cochrane's falls review is also explicitly uncertain about walking's effect on the rate of falls. Walking is worth doing for many other reasons, including blood pressure, but as a bone program it is incomplete.
Is heavy lifting safe if I already have low bone density?
LIFTMOR tested exactly this in postmenopausal women with low to very low bone mass and found no increase in vertebral fracture, with one minor adverse event across the trial. Two conditions attach to that result: the training was highly supervised, and the participants were otherwise healthy. Supervision is the operative word, not the load.
Which exercise is best for the spine, and which for the hip?
They differ, which is the point. The 2011 Cochrane review found combination programs best at the spine and lower-limb progressive resistance training best at the femoral neck. The 2026 network meta-analysis ranked impact exercise highest at the total hip and trochanter. Any answer that names one exercise without naming a site is skipping the question.
How long before it makes a difference?
Longer than most people plan for. The most recent analysis found that interventions of 52 weeks or more produced more consistent and sustained improvements than shorter ones, and the trials in it all ran at least 24 weeks.
Does exercise work as well as osteoporosis medication?
We are not answering that here. The drug comparison figures that circulate come from review authors summarising trials we have not verified, and reprinting them as our own would be exactly the shortcut this site avoids. Discuss medication with a clinician who can see your bone density and fracture risk.
When to talk with a clinician
Get advice before starting impact or heavy resistance work if you have had a fragility fracture, a known vertebral fracture, severe osteoporosis, or spinal problems. If you have not had bone density measured and you are postmenopausal, have lost height, or have fractured from a low-level fall, ask whether a DXA scan is appropriate. And ask specifically for a program that includes balance work, since that is the component with the best evidence for the outcome you actually care about and the one most likely to be left out.
