“…physiotherapists) (Duraiswamy et al, 2007;Stubbs et al, 2014a, Stubbs et al, 2014b, psychiatrists (Chen, Chen, & Huang, 2009;Pesek, Mihoci, Medved, & Solinc, 2011), and exercise psychologists (Dodd, Duffy, Stewart, Impey, & Taylor, 2011). Other studies stated that research staff were the primary physical activity messengers (Beebe et al, 2009;Beebe et al, 2010;Beebe et al, 2013;Gorczynski et al, 2014a;Gorczynski, Faulkner, Cohn, & Remington, 2014b;Leutwyler et al, 2012;Methapatara & Srisurapanont, 2011), whilst other studies did not specify who were messengers (Acil, Dogan, & Dogan, 2008;Maggouritsa et al, 2014;McKibbin et al, 2006;Wu et al, 2007). Although many messengers were identified, the effectiveness of messengers was not assessed.…”