Overweight and obesity caused by energy imbalance correlate closely with the increased incidence of many diseases. Physical activity plays a significant role in keeping energy balance. "Physical Activity Guidelines Advisory Committee Report, 2008 " systematically reviews the role of physical activity in keeping weight stability, preventing weight regain and maintaining body composition parameters and the effect of sex, age and race/ethnicity on physical activity concerning weight maintenance. The Guidelines are valuable for reference in implementing China's Mass Fitness Program and have certain guiding effect for the development of sports science in China. |