“Analysis of the Sports Class Program for Sustainable Young Athlete Development: (A Case Study at Muhammadiyah 2 Junior High School, Surabaya)”, Compet. J. Pendidik. Kepelatihan Olahraga, vol. 17, no. 3, pp. 3106–3119, Oct. 2025, doi: 10.26858/cjpko.v17i3.438.