Martins J, Marques A, Peralta M, Palmeira A, Carreiro da Costa F. Correlates of physical activity in young people: A narrative review of reviews. Implications for physical education based on a socio-ecological approach (Correlatos de actividad física en jóvenes: Una revisión narrativa de revisiones. Implicaciones para. Retos. 2017;31:292-299. doi:10.47197/retos.v0i31.53505