The fitness fad.
D000223:Adaptation, Psychological; D001265:Athletic Injuries / Q000209:etiology; D001823:Body Composition; D004734:Energy Metabolism; D006266:Health Education; D006801:Humans; D009765:Obesity / Q000628:therapy; D010349:Patient Compliance; D010806:Physical Education and Training / Q000639:trends; D010809:Physical Fitness; D012017:Referral and Consultation; D012420:Running