M. C. Portillo-Torres, Óscar Hernández-Quesada, and H. Quirós-Quirós , Trans., “Teachers and Students Opinions of Physical Education Classes in High School”, Rev. Electr. Educare, vol. 20, no. 2, pp. 1–23, Apr. 2016, doi: 10.15359/ree.20-2.5.