Health versus weight as motivations for physical activity among adolescent girls have different antecedents and consequences: 889: june 1 4:15 PM - 4:30 PM. Journal   Medicine and science in sports and exercise. Citation   Med Sci Sports Exerc. 39(5 Suppl):S86 Publication date   2007 May Authors   Baker BL Trost SG Birch LL Davison KK Investigators   Leann Birch