López-Castedo, Antonio, José Domínguez Alonso, and Iago Portela-Pino. “Predictive Variables of Motivation and Barriers for the Practice of Physical Exercise in Adolescence”. Journal of Human Sport and Exercise 13, no. 4 (December 10, 2018): 907–915. Accessed June 21, 2024. https://www.jhse.ua.es/article/view/2018-v13-n4-predictive-variables-motivation-barriers-physical-ex.