If you have low bone density, should you avoid lifting heavy weights?

If you have been told you have osteopenia or osteoporosis, it is understandable to feel cautious about exercise. You may have been told to be careful. To avoid heavy lifting. To stick to gentle movement. To focus on walking, Pilates, or yoga. Some of that advice can be helpful. But if your goal is to support your bone health, “gentle” is not always the same as “effective”.

Your bones are living tissue. They respond to load. In other words, they adapt to the demands you place on them. That is one reason strength training matters so much: it does not just affect your muscles. It also gives your bones a reason to stay stronger. 

Your bones are living tissue. They respond to load. In other words, they adapt to the demands you place on them.

Your bones need enough challenge to adapt

A lot of exercise marketed to women is built around being light, low-impact, and non-intimidating. There is nothing wrong with that in itself. Walking, yoga and Pilates can all be valuable for your general health, confidence, mobility and wellbeing. But when it comes to building or preserving bone density, the body usually needs a stronger signal.

One of the best-known studies in this area is the LIFTMOR trial. It looked at postmenopausal women with low bone mass who completed a supervised programme of high-intensity resistance and impact training twice a week. The programme included exercises such as deadlifts, squats and overhead press. The researchers found improvements in bone mineral density at the lumbar spine, along with gains in functional performance. The trial reported high adherence, and only one adverse event was noted: a minor lower back spasm. 

That does not mean you should immediately start lifting as heavy as possible. It does mean that the old idea that women with low bone density should only do very light exercise is too simplistic.

Not all exercise has the same effect on bone

This is where the message often gets muddled. If you enjoy yoga, Pilates, swimming, walking or mobility work, that is not a problem. Those forms of exercise can still play an important role in your overall health. But they do not all affect bone in the same way.

An earlier randomised trial in perimenopausal women found that an 18-month calisthenics programme did not produce significant changes in bone mineral density at any measured skeletal site, despite other potential benefits of being active. 

That is the important distinction: an exercise can be good for you without being the best tool for improving bone density. So if you have been told to “just do Pilates for your bones”, it is worth knowing that this may not be enough on its own if bone loading is the main goal.

One of the best-known studies in this area is the LIFTMOR trial. It looked at postmenopausal women with low bone mass who completed a supervised programme of high-intensity resistance and impact training twice a week. The researchers found improvements in bone mineral density at the lumbar spine.

This conversation matters earlier than most women are told

One of the biggest problems with bone health advice is timing.

Many women do not hear about bone density until they are already postmenopausal, already injured, or already told they have osteopenia. But your peak bone mass is built much earlier in life, with childhood, adolescence, and early adulthood being particularly important years for building your skeletal reserves. Sources differ slightly in how they describe the timing, but the broad message is consistent: much of your lifetime bone “bank” is built before or around early adulthood. 

That does not mean it is too late for you if you are reading this later in life. It is not. Bone can still respond to the right kind of training. But it does mean you deserve better information than the idea that bone health is only about calcium supplements and being careful.

Strength matters here too.

If you have low bone density, caution and confidence both matter

If you have low bone density, the answer is not fear.

It is also not recklessness.

You do not need to prove anything by jumping straight into maximal lifting. But you also do not need to assume that your body is fragile forever. The most helpful approach is usually a progressive one: looking at where you are now, what you can tolerate, how you move, how confident you feel, and then building from there.

For you, that might mean first learning how to squat, hinge, press, carry and brace well. It might mean rebuilding confidence after a diagnosis that has made you wary of movement. Or it might mean returning to heavier training because you already have experience and your body is ready for that next step.

The key message is that your programme should be built around what you need, not around outdated assumptions about what women “should” do.

What we believe at Unity

At Unity, we do not believe your care should make you smaller, weaker, or more fearful of your body.

We believe your body deserves the right kind of challenge.

That might mean helping you move well first. It might mean gradually increasing load. It might mean building strength in a way that feels safe, supported and realistic for your life. And yes, in some cases, it may mean lifting heavier than you expected. Because protecting your bones does not always mean doing less. Often, it means learning how to do more, properly.

The takeaway

If you have been told you have low bone density, it is worth knowing this:

• Walking is good. Pilates can be helpful. Yoga has value. But when the goal is to improve or preserve bone density, these are not always enough on their own. Bone responds to meaningful load, and well-supervised resistance training has been shown to help. 

• You do not need to be frightened of strength training.

• You need the right starting point, the right coaching, and the right progression.

• Because strong bones are not built by avoiding challenge forever.

• They are built by giving your body a reason to stay strong.

References

• Watson, S.L., Weeks, B.K., Weis, L.J., Harding, A.T., Horan, S.A. and Beck, B.R., 2018. High-intensity resistance and impact training improves bone mineral density and physical function in postmenopausal women with osteopenia and osteoporosis: the LIFTMOR randomized controlled trial. Journal of Bone and Mineral Research, 33(2), pp.211–220. 

• Heinonen, A., Kannus, P., Sievänen, H., Oja, P., Pasanen, M., Rinne, M., Uusi-Rasi, K. and Vuori, I., 1998. Effect of two training regimens on bone mineral density in healthy perimenopausal women: a randomized controlled trial. Journal of Bone and Mineral Research, 13(3), pp.483–490. 

• Office of the Surgeon General (US), 2004. Bone health and osteoporosis: a report of the Surgeon General. Bethesda, MD: Office of the Surgeon General. 

• Hereford, T. and others, 2024. Understanding the importance of peak bone mass. JBMR Plus. 

• Mayo Clinic, 2026. Bone health: tips to keep your bones healthy.