“…These include social support from health professionals, family, and friends (Coleman, Cox, & Roker, 2008;Zakarian, Hovell, Hofstetter, Sallis, & Keating, 1994), social modeling of physical activity (Feltz & Riessinger, 1990;Fox, Rejeski, & Gauvin, 2000), having fellow exercise participants (Carron, Hausenblas, & Mack, 1996), and group exercise programs (Dishman & Buckworth, 1996). A novel but promising approach is to exploit social psychological processes that have been shown to enhance motivation in task performing groups (e.g., for overviews, see Baron & Kerr, 2003;Karau & Williams, 1993).…”