RT Journal Article T1 Age as a determining variable in the practice or abandonment of physical exercise among young people A1 Portela Pino, Iago A1 Valverde Esteve, Teresa A1 Martínez Patiño, María José K1 6102.04 Psicología Escolar K1 61 Psicología AB Background: Numerous studies have reported a gradual decline in the practice of physical exercise with age, confirming high dropout rates in the adolescent period. The aim of this study was to investigate the motivation or barriers that lead to greater or lesser adherence to physical exercise among children and adolescents.Methods: In this study, 1,081 individuals volunteered to participate [239 children (age: 10.89 ± .66 years) and 842 adolescents (age: 14.9 ± 1.75 years)]. For this purpose, we used the Self-Report on Motivation for Exercising (AMPEF) and Self-Report on Barriers to Exercising (ABPEF) questionnaires.Results: The most significant motivational factors in the practice of physical exercise (in both children and adolescents) are competition, social recognition and challenge (t = -16.02, p < .001), prevention and positive health (t = 5.24, p < .001) and affiliation, fun and well-being (t = -19.54, p < .001), while the barriers focus on fatigue and laziness (t = -13.20, p < .001) and body image and physical-social anxiety (t = -5.71, p < .001). It is also observed that adolescents showed significantly higher motivation than children and greater presence of barriers in the practice of physical exercise.Conclusions: The age is a determining variable to include in preventive and intervention programs for the practice of physical exercise. PB PLoS ONE SN 19326203 YR 2021 FD 2021-06-24 LK http://hdl.handle.net/11093/8603 UL http://hdl.handle.net/11093/8603 LA eng NO PLoS ONE, 16(6): e0253750 (2021) NO Generalitat Valenciana | Ref. Best/2019/110 DS Investigo RD 29-abr-2025