Ensure adequate vitamin D intake. Normally, we make enough vitamin D from exposure to as little as 10 minutes of sunlight a day. Engage in a regular regimen of weight-bearing exercises where bone and muscles work against gravity. This includes walking, jogging, racquet sports, stair climbing and team sports. Also, lifting weights or using resistance machines appears to help preserve bone density.
Exercise also improves balance and muscle tone and imparts a sense of well being.
If you already have been diagnosed with osteoporosis, any exercise program should be evaluated for safety by your doctor before you begin. Twisting motions and impact activities may need to be curtailed depending on the severity of your condition.