Effects of high-intensity interval training ratios on physical fitness in junior high students. Jurnal SPORTIF : Jurnal Penelitian Pembelajaran, [S. l.], v. 11, n. 3, p. 494–513, 2025. DOI: 10.29407/js_unpgri.v11i3.26469. Disponível em: https://ojs.unpkediri.ac.id/index.php/pjk/article/view/26469. Acesso em: 1 jan. 2026.