“…Correlational evidence suggests that PA is positively related to self-concept (Asci, Kosar, & Isler, 2001;Crocker, Sabiston, Forrestor, Kowalski, & McDonough, 2003;Dishman, Hales, Pfeiffer, Felton, Saunders et al, 2006;Nigg, Norman, Rossi, & Benisovich, 2001;Raustorp, Stahle, Gudasic, Kinnunen, & Mattsson, 2005), and a recent review of intervention studies among children and adolescents supported the hypothesis that increasing PA yields a shortterm improvement in self-concept among youth (Ekeland et al, 2004). The authors of the review, however, note that many of the studies among youth have been subject to methodological limitations; only one of the 25 studies included in the review was judged to have a "low risk of bias", and 14 had a "high risk of bias".…”