背景已有十分强有力的论据说明,体力不活动者增加许多健康问题,包括非传染性疾病,如冠心病、2型糖尿病、乳癌、直肠癌,缩短寿命。因为全球有许多人体力不活动,所以成为一个重大公共保健问题。作者的目的是通过估计如果体力不活 Background There is already strong evidence that physical inactivity increases many health problems, including noncommunicable diseases such as coronary heart disease, type 2 diabetes, breast cancer, rectal cancer, and shortened life expectancy. Because many people around the world are physically inactive, they become a major public health problem. The author’s purpose is to pass estimates if physical inactivity