Peers' influence on exercise enjoyment: A self-determination theory approach. Monday, 4 October 2010 | Motivación y promoción de la actividad física y el deporte Moreno, J. A., López de San Román, M., Martínez Galindo, C., Alonso, N., y González-Cutre, D. (2008). Peers’ influence on exercise enjoyment: A self-determination theory approach. Journal of Sports Science and Medicine, 7, 23-31.