Effects of an extracurricular program of physical-sports activities on the physical fitness of high school students. RIAF. International Journal of Physical Activity, [S. l.], v. 4, n. 1, p. 90–101, 2026. DOI: 10.53591/2869. Disponível em: https://revistas.ug.edu.ec/index.php/riaf/article/view/2869. Acesso em: 10 apr. 2026.