title: Dropping the ball and picking up fat: youth physical activity, body fatness, and the conundrum of causality.
authors.affiliation: School of Exercise and Nutritional Sciences, San Diego State University, and the San Diego Prevention Research Center, University of California San Diego, San Diego, California, USA. smarshal@mail.sdsu.edu
authors.forename: Simon J
authors.initials: SJ
authors.lastname: Marshall
mesh_terms: D050154:Adiposity; D000293:Adolescent; D015984:Causality; D015444:Exercise; D006801:Humans; D009043:Motor Activity; D009765:Obesity / Q000209:etiology*