“Experimental Analysis of High-Intensity Interval Training (HIIT) Effects on vo₂max and Recovery Efficiency in Football Players”. Jurnal SPORTIF : Jurnal Penelitian Pembelajaran 11, no. 3 (January 13, 2026): 529–546. Accessed March 3, 2026. https://ojs.unpkediri.ac.id/index.php/pjk/article/view/27392.