“…The research addressing the social cognitive component of PA as a health promotion behavior has been predominantly descriptive and exploratory, and in a number of studies, self-efficacy and PA behaviors have been significantly correlated (.35 to .53) (Carroll, 1995;Conn, 1998;McAuley, Lox, & Duncan, 1993;Oka, Gortner, Stotts, & Haskell, 1996;Wilcox & Strandt, 1996). In pre-or quasi-experimental studies (Calfas et al, 1997;McAuley, Schaffer, & Rudolph, 1995) researchers have demonstrated positive relationships between self-efficacy and PA, and the dynamic nature of selfefficacy over time.…”