Spinal and pelvic stabilization exercise failed to improve bone density but it could maintain bone density when compared to control group. Lee20) researched how training of t’ai chi chuan affects bone density and bone marker of women after menopause for 12 weeks. As a result, training of t’ai chi chuan for 12 weeks failed to increase bone density but it decreased rates of bone loss. Also, Han14) performed resistance exercise program targeting 11 women after menopause for 6 weeks and measured bone density of lumbar and femur. There was not a meaningful difference statistically in this result but bone density of lumbar increased. It implies that we can see the change of bone density by doing exercise for a short time and especially, this study receives support in the way that exercises that don’t have a high intensity such as t’ai chi chuan can affect rates of bone loss.