Recent research (Martin et al., 2006) presented a new, multidimensional approach to physical activity motivation (using the Physical Activity Motivation Scale [PAMS]) operationalized through four factors: adaptive cognition, adaptive behavior, impeding/maladaptive cognition, and maladaptive behavior. The present study extends this early research by recruiting a larger sample of 705 young people, in late adolescence, using a shortened form of PAMS (PAMS-Revised), and including physical and nonphysical correlates as a means of better understanding its validity. Findings confirmed a sound four-factor framework comprising reliable factors. Findings also demonstrated hypothesized relations between physical activity motivation and physical correlates and, to a lesser extent, between physical activity motivation and more general life correlates. (Contains 2 tables and 1 figure.)