of inactive boys tends to be heavier than active boys, especially during adolescence. Body weight can be potentially influenced by regular activity, resulting in changes in body composition. Presently available data are derived primarily from the two compartment model: Body weight = FFM + FM where FFM = fat-free mass. 1 Jul 'La La Land' Audition: James Corden's Ode to the Oscars - Duration: The Late Late Show with James Corden 2,, views · Hellboy 2: The Golden Army (7/10) Movie CLIP - Hellboy "Smokes" Johann () HD - Duration : Movieclips 2,, views · · IT Trailer () - Duration. Height, weight, and body composition of three groups followed from 11–18 years were compared: active (n = 8), moderately active (n = 18) and least active (n = 13 ). The groups differed slightly in body composition at 11–12 years. During the course of the study, the most active boys gained more FFM and less FM than the .