What Is Physical AC Physical activity has been defined as any bodily movement produced by the contraction of skeletal muscle (a 骼肌收缩) that increases energy expenditure above a basal level ° In this guidelines, physical actiⅳiy generally refers to the subset of physical activity that enhances healthWhat Is Physical Activity? • Physical activity has been defined as any bodily movement produced by the contraction of skeletal muscle(骨 骼肌收缩) that increases energy expenditure above a basal level. • In this guidelines, physical activity generally refers to the subset of physical activity that enhances health