Does exercise actually build bone?

One of the first questions I get from patients diagnosed with osteoporosis or osteopenia is about exercise. Usually it's one of two things: "Should I be careful?" or "Is walking enough?" The answer to both is the same: not quite.

Exercise is one of the most effective tools we have for bone health. But the type of exercise matters enormously. Some forms of activity are genuinely bone-building. Others, while excellent for general fitness, do almost nothing for your skeleton. Understanding that distinction is one of the most useful things you can do if you care about your bones.

How bone responds to exercise

Bone is living tissue. It's constantly being remodelled. It's broken down by cells called osteoclasts and rebuilt by cells called osteoblasts. What determines whether you gain or lose bone over time is the balance between those two processes.

When you load a bone mechanically (by lifting something heavy, by landing from a jump, by pushing against resistance) the bone cells detect that strain and respond by laying down new bone where the force was applied. This is sometimes called Wolff's law: bone adapts to the loads placed on it.

The catch is that not all loading is equal. To trigger new bone formation, the force needs to be high in magnitude and applied at a relatively fast rate. A slow, gentle stretch doesn't do it. A heavy deadlift does. A landing from a jump does. That's why certain types of exercise are osteogenic (bone-building) and others are not.

The LIFTMOR trial: what actually happened

The most important study in this field is an Australian trial called LIFTMOR, conducted at Griffith University. It's worth understanding what they did, because the results changed the way many clinicians think about exercise and osteoporosis.

The researchers recruited 101 postmenopausal women with low bone mass (T-scores below -1.0). Half were assigned to a supervised high-intensity resistance and impact training programme, twice a week for 30 minutes. The other half did a low-intensity home exercise programme as a control.

The high-intensity group did deadlifts, overhead presses, and back squats. They performed 5 sets of 5 repetitions at loads above 85% of their one-repetition maximum. They also did jumping chin-ups with drop landings for impact loading. These are not gentle exercises. They're the same compound lifts used by strength athletes.

The results

The exercise group gained bone at the lumbar spine while the control group lost it. That is a net difference of over 4%. At the femoral neck (a critical fracture site), the exercise group held steady while controls declined. All functional performance measures improved significantly: strength, balance, sit-to-stand time, and timed walking.

The LIFTMOR findings have been supported by further research. The MEDEX-OP trial, also Australian, confirmed that this type of training improved hip bone geometry and strength in postmenopausal women, including those already taking bone medication. When exercise was combined with medication, the gains were greater than with either alone.

A 2025 systematic review pooling 17 randomised trials in postmenopausal women found that resistance training significantly improved bone density at the lumbar spine, femoral neck, and total hip. The strongest effects were seen with high-intensity loading (above 70% of maximum) performed at least twice per week.

What doesn't build bone, and why

This is where most people are surprised. Several popular forms of exercise, while genuinely beneficial for cardiovascular fitness, flexibility, and mental health, do not provide the mechanical stimulus needed to build bone.

Swimming

A 2024 systematic review of 36 studies found that bone density in swimmers was no different from sedentary controls at the spine, hip, and femoral neck. Swimming removes gravitational loading entirely. The water supports your body weight, so the skeleton doesn't experience the strain needed to trigger bone remodelling. Swimming is excellent exercise. It's just not bone-building exercise.

Cycling

Cycling is non-weight-bearing and non-impact. There is no significant evidence that cycling alone improves bone density in postmenopausal women. Like swimming, it has real cardiovascular and metabolic benefits, but it doesn't load the skeleton through gravity.

Walking

This is the one that catches people off guard. Walking is weight-bearing, but the loads are low and repetitive. Your skeleton adapts to them quickly, and they stop being a meaningful stimulus. The current Healthy Bones Australia position is clear: walking, swimming, and cycling have cardiovascular and metabolic benefits but are not a therapeutic recommendation for building bone or preventing bone loss. Walking is better than nothing, and it has genuine health value, but on its own it's not enough if bone density is your concern.

Yoga

Yoga can improve balance (which helps prevent falls, covered below), but the forces involved are generally too low and too slow to be osteogenic. Some yoga poses also involve sustained spinal flexion, which may need modification in people with vertebral osteoporosis.

Exercise and falls prevention

Building bone is only half the equation. The other half is not falling on it. Most osteoporotic fractures happen because of a fall, and exercise is the single most effective intervention for reducing fall risk.

A major Cochrane review of 108 randomised trials involving over 23,000 older adults found that exercise reduces the rate of falls by 23% and may reduce fall-related fractures by 27%. The most effective programmes combined balance training with resistance exercises. That also happens to be the best combination for bone density.

The implication is straightforward: a programme that includes both strength and balance training protects you on two fronts: stronger bones and fewer falls. That's the combination I recommend.

What Australian guidelines recommend

The updated RACGP/Healthy Bones Australia guideline (3rd edition, published 2024) recommends lifestyle measures including weight-bearing and resistance exercise alongside any pharmacotherapy for osteoporosis. It's not an either/or. Exercise and medication work better together than either alone.

Healthy Bones Australia's exercise prescription statement is more specific. It recommends moderate to high intensity resistance training as an effective intervention, noting the greatest benefit comes from combining resistance training with weight-bearing impact activities. Their guidance includes:

• Resistance training 2–3 days per week, at loads above 70% of your maximum, with fewer than 8 repetitions per set
• Impact activities with ground reaction forces greater than twice your body weight (landing, jumping, stair climbing)
• Balance training daily, progressing to higher challenge as you improve
• Supervised exercise by a clinical exercise physiologist or physiotherapist for anyone with diagnosed osteoporosis

Healthy Bones Australia has endorsed the ONERO programme, the clinical exercise programme developed directly from the LIFTMOR research. It's delivered by accredited exercise physiologists and physiotherapists, and it's available through licensed providers in Adelaide and across Australia.

Is it safe to lift heavy with low bone density?

This is the concern I hear most often, and it's understandable. The idea of lifting heavy weights when your bones are already fragile feels counterintuitive. But the evidence consistently shows the opposite of what most people expect.

In the LIFTMOR trial, women with T-scores as low as -2.5 (established osteoporosis) were lifting at over 85% of their one-rep max, and the only adverse event was a minor back spasm. No fractures. The follow-up vertebral imaging study found no new spinal fractures in the exercise group. The safety record of supervised high-intensity resistance training in osteoporosis research is remarkably good.

The key word is supervised. The LIFTMOR participants spent the first month learning correct movement patterns with lighter loads before progressing. Every session was supervised by an exercise professional. Correct technique, gradual progression, and ongoing supervision are what make this safe.

There's also the pelvic floor question. Heavy lifting and impact landing can load the pelvic floor, particularly in postmenopausal women. A pelvic floor assessment before starting a high-intensity programme is a sensible step, especially if you've had any history of incontinence.

The bottom line on safety: the risk of doing nothing is far greater than the risk of supervised exercise. Inactivity leads to further bone loss, muscle weakness, and increased fall risk. Supervised high-intensity training, properly progressed, is one of the safest and most effective things you can do.

How to get started

If you've been diagnosed with osteoporosis or osteopenia, the first step is a conversation with your GP. Together we can assess your overall situation, including fracture risk, current fitness, any other conditions, and determine the right approach for you.

For most people with low bone density, I'd recommend seeing an accredited exercise physiologist with experience in bone health. They can design a programme that's targeted to your bones, appropriate for your current capacity, and progressed safely over time. Exercise physiologists are eligible allied health providers under a GP Chronic Condition Management Plan, which means you may be able to access Medicare-rebated sessions if you have a qualifying chronic condition.

If you're starting from a low fitness base, that's completely fine. The LIFTMOR programme itself starts with a month of lighter loads focused on learning movement patterns. You don't walk in and deadlift on day one. Every evidence-based bone health exercise programme is designed with progressive overload. You start where you are and build from there.

"I'm too old to start"

No, you're not. The women in the LIFTMOR trial were aged 58 to 75, with bone density low enough to be classified as osteoporosis in many cases. They improved. The Cochrane review on falls prevention included trials with a mean participant age of 76. They benefited from exercise too.

Starting later is not the same as starting too late. Your bones can still respond to loading at any age. Your muscles can still get stronger. Your balance can still improve. The question isn't whether exercise will help. It's finding the right programme, the right supervision, and the right starting point for where you are now.

Clinical information in this article is informed by the LIFTMOR trial (Watson et al. 2018, 2019), the MEDEX-OP trial (Kistler-Fischbacher et al. 2022), the Cochrane review on exercise for falls prevention (Sherrington et al. 2019), the 2024 RACGP/Healthy Bones Australia guideline, the Healthy Bones Australia exercise prescription statement (2024), and the ESSA position statement on exercise for bone health (Beck et al. 2017). This is general information only. Your GP can advise on what's relevant for your individual situation.

Written by

Dr David Nguyen

MBBS · FRACGP

Exercise prescription for bone health is something I discuss with patients regularly at Pro Health Care Glenelg. I wrote this guide because the evidence on what actually works is strong and specific, and most of my patients are surprised by it.

Learn more about Dr David Nguyen → First published: 19 May 2026 · Last reviewed: 19 May 2026