Bone density tends to peak in early adulthood and decline slowly after that, with a faster drop for many women in the years around menopause. Lower density raises the risk of fractures, particularly at the hip, spine and wrist.
Bone is not inert. It remodels continuously, and it responds to how it is loaded. That is the reason training matters here, and also the reason the details of how you load it matter.
Why loading matters
Bone responds best to loads that are relatively heavy, varied in direction and higher than what it is used to. Everyday walking is valuable for many reasons, but because it is familiar and fairly light, it does little on its own to stimulate bone. Swimming and cycling are excellent for fitness and add little load to the skeleton.
Strength training works through two routes: the weight you hold, and the pull of your own muscles on the bone. Stronger muscles also mean better balance, and fewer falls means fewer opportunities for a fracture.
Progressive resistance
The useful pattern is the same as for muscle: movements that load the hips, spine and legs, done with good control and made gradually harder. Squats to a box, deadlifts from a raised position, lunges, step-ups, rows and overhead presses all fit. Someone starting with 10 lb dumbbells for goblet squats might work toward 25 or 35 lb over several months.
Effort matters. Sets that end with only a couple of reps left in reserve appear to be more useful for bone than very light work, provided technique holds and the load has been built up over time.
Impact, introduced gradually
Short, sharp forces also stimulate bone. For people without osteoporosis and with healthy joints, this can start very small: heel drops (rising onto your toes and letting your heels drop to the floor), stepping off a low step, then small hops in place. A few sets of 10–20 a few days a week is plenty.
Impact is the part to be most careful with. Skip it if it causes joint pain, and do not add it without medical guidance if you have been told your bones are fragile.
Setting realistic expectations
Bone changes slowly. In older adults, training is often as much about slowing loss and maintaining what you have as about gaining density, and results vary between people. Calcium, vitamin D, adequate protein and any medication your doctor prescribes all play a part alongside training, not instead of it.
What to do this week
If you have not had a bone density scan and are unsure whether you should, ask your doctor. If you are cleared, add two strength sessions that include a squat, a hinge and a carry, and keep a log so you can see the load rise over time.
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