There is strong evidence that physical activity early in life contributes to higher peak bone mass. Physical activity during early age was more strongly associated with higher bone mineral density (BMD) at all sites than was physical activity in the past two years (2). Lifetime weight-bearing is more strongly associated with higher BMD of the total and peripheral skeleton than is non-weight-bearing exercise (2). Exercise during the later years in the presence of adequate calcium and vitamin D probably has a modest effect on slowing the decline in BMD (3). Physical activity, particularly weight-bearing exercise, is thought to provide the mechanical stimuli or "loading" important for the maintenance and improvement of bone health (1). A number of systematic reviews and meta-analyses have suggested that an exercise programme combining low impact weight bearing exercise and high-intensity resistance training maintains bone density in men and postmenopausal women (4-6). Resistance training may have more profound site-specific effect than aerobic exercise (7). High-intensity resistance training may have added benefits for decreasing osteoporosis risks by improving strength and balance, and increasing muscle mass