Here's a fact that surprises many people: swimming and cycling, for all their benefits, do very little for your bones. That's not a knock on them — they're wonderful for your heart, your joints, and your mood. But when it comes to building or preserving bone, the type of exercise matters enormously, and understanding why helps you spend your effort where it counts most after menopause.
Bone responds to load, not just movement. Bone is living tissue that constantly rebuilds itself, and it makes a simple calculation: if force is regularly travelling through it, it holds onto mineral and stays strong; if not, it quietly gives some up. The trigger is mechanical load passing through the skeleton. Swimming and cycling support your weight — the water or the saddle carries you — so relatively little load reaches your bones, and the bone-building signal is weak. Weight-bearing exercise, where your skeleton has to carry and move your body against gravity, sends a much stronger signal.
Two kinds of bone-loading exercise:
- Weight-bearing aerobic activity — walking, jogging, hiking, stair climbing, dancing, racquet sports. Your legs and spine carry your bodyweight, and each step loads the hip and spine — precisely the sites most at risk of fracture. The more impact (within what's comfortable and safe for you), the stronger the signal: brisk walking beats strolling, and adding some stairs or gentle jogging beats flat, slow walking.
- Resistance training — lifting weights, resistance bands, and bodyweight moves like squats and push-ups. Here the load comes from the resistance rather than gravity alone, and you can target specific areas. A loaded squat, for example, drives force straight up through the femur and lower spine — the exact bones a DEXA scan measures.
The best programme combines both. Weight-bearing aerobic activity most days (a brisk walk counts, and it's the easiest to sustain), plus dedicated resistance training two to three times a week, gives bone the varied, repeated loading it responds to best. They're complementary: the walking keeps up a steady background signal, while the strength work provides the concentrated, progressive load that drives real adaptation.
A note on impact and safety. Higher-impact movements (jumping, hopping, jogging) send stronger signals to bone, and for many women a little impact is genuinely beneficial. But if you already have low bone density, osteoporosis, or joint problems, some high-impact and deeply loaded movements may not be right for you — so if that's your situation, get individual guidance before adding them. The goal is the right load for your body, applied consistently over years, not the most dramatic load you can manage once.
The mindset that helps. Think of every walk, every flight of stairs taken instead of the lift, and every squat as a small deposit into your bone account — a signal that says 'keep this bone, I'm using it.' Bone health is a long game, and it's the accumulation of these ordinary loading moments, year after year, that helps protect you.
This is general information, not personal medical advice. If you have a health condition, or aren't sure whether an exercise is right for you, talk to your own doctor.