“The Relationship Between Physical Activity, Concentration, and Academic Achievement in High School Students”, Compet. J. Pendidik. Kepelatihan Olahraga, vol. 18, no. 1, pp. 1187–1196, Feb. 2026, Accessed: Feb. 22, 2026. [Online]. Available: https://competitor.idjournal.eu/index.php/competitor/article/view/562