title: Physical activity, physical fitness, and health: time to act.
authors: J P
authors: JP
authors: Koplan
authors: C J
authors: CJ
authors: Caspersen
authors: K E
authors: KE
authors: Powell
mesh_terms: D002423:Cause of Death; D015444:Exercise; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D010809:Physical Fitness