title: Physical activity: how much is enough?
authors.forename: Jim
authors.initials: J
authors.lastname: McCaffree
mesh_terms: D015444:Exercise / Q000502:physiology* / Q000523:psychology; D006293:Health Promotion; D006331:Heart Diseases / Q000517:prevention & control; D006801:Humans; D008019:Life Style; D009765:Obesity / Q000209:etiology* / Q000517:prevention & control / Q000523:psychology; D010809:Physical Fitness / Q000502:physiology*; D011322:Primary Prevention; D012307:Risk Factors; D013997:Time Factors