T’ai chi chuan mentioned earlier is a low intensity exercise which has advantages that it does not use tools and it is not limited by place25). Also, spinal and pelvic stabilization exercise used in this study is a low intensity exercise which has advantages that it doesn’t use tools and it can be performed at home or everywhere in indoor. We expect that it can prevent osteoporosis occurred after menopause and can be a good way to reduce loss in terms of social economy18). But many researches are showing different results about exercise intensity and exercise period. We can guess that many researches can have different results because taking calcium agent, injecting hormone and daily life were not controlled properly9). But most researches have a common opinion that proper exercise has a positive effect on prevention and treatment of osteoporosis23). Also, this study did not control taking calcium agent, daily life, and starting point of menopause of subjects exactly. But through this research, we can see the fact that although trunk stability exercise cannot change bone density meaningfully, it can maintain bone density. In the future, it is randomly necessary to study things related this because results of researches can show different results according to exercise intensity, exercise period, age, weight, hormone status and mediation period. It is considered that it will help to prevent and treat patients with osteoporosis a lot