Gómez-Mármol, A., Sánchez-Alcaraz Martínez, B. J., & Bazaco Belmonte, M. J. (2017). Physical Education as a fun subject in Secondary Education: sedentarism and practice of extracurricular physical-sport activities. Sportis. Scientific Technical Journal of School Sport, Physical Education and Psychomotricity, 3(3), 605–620. https://doi.org/10.17979/sportis.2017.3.3.1829