Aim Aggressive behaviour is one of the most frequent antisocial behaviours in adolescents, particularly in those living in low-income urban communities (Rivara, 2002). Participation in sport, particularly in those involving significant physical contact like play fighting, has been proved having positive effects in reducing young adolescents' aggression (Carraro et al., 2014). The purpose of this study was to analyse the effects of play fighting on self-reported aggression in a group of youths from low-income urban communities. Method A sample of 98 young adolescents (boys=66; girls=32; mean age=13.4±1.2 years) from eight Youth Recreation Centres for adolescents with problematic background were initially involved in the study. Participants ...