How does exercise help prevent osteoporosis?

Exercise can help prevent osteoporosis and loss of bone density. Any resistance activity -- walking up a hill or lifting groceries -- strengthens muscles and, just as important, increases bone density, making bones stronger and less likely to fracture. Indeed, resistance activity actually increases the calcium content of bones.

A study of over 9,500 women found that those who walked three days a week had a 30 percent lower risk of hip fracture; more walking and walking up hills were associated with even lower risks of hip fracture. Although strengthening -- or weight-bearing -- exercises are the best for improving bone strength, new evidence shows that exercise such as riding a stationary bicycle and water aerobics may also increase bone density.

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