title: Ready, set, go for physical activity.
mesh_terms: D000293:Adolescent; D002648:Child; D005081:Exercise Therapy / Q000458:organization & administration*; D006801:Humans; D009765:Obesity / Q000517:prevention & control; D010806:Physical Education and Training / Q000458:organization & administration*; D012572:School Health Services / Q000458:organization & administration; D057185:Sedentary Behavior