“…Eight randomized controlled trials were included in this review (Coppack, Kristensen, & Karageorghis, 2012;Friedrich, Gittler, Arendasy & Friedrich, 2005;Friedrich, Gittler, Halberstadt, Cermak, & Heiller, 1998;Harkapaa, Jarvikoski, Mellin, Hurri, & Luoma, 1991;Harkapaa, Mellin, Jarvikoski, & Hurri, 1990;Huyser, Buckelew, Hewett, & Johnson, 1997;Linton, Hellsing, & Bergstrom, 1996;Peterson et al, 2015;Reilly, Lovejoy, Williams, & Roth, 1989;Vong, Cheing, Chan, So, & Chan, 2011) (Table 1). Study sample sizes ranged from 40 to 459 participants, totalling 1,018 participants.…”