Festiawan, Rifqi, Lim Boon Hooi, Kartono Pramdhan, Masnur Ali, and Arief Nuryadin. “Improvement Physical Fitness Level on Mountain Climbing Athletes: High-Intensity Interval Training and Oregon Circuit Training Effect”. Jurnal SPORTIF : Jurnal Penelitian Pembelajaran 7, no. 1 (April 2, 2021): 19-36. Accessed November 22, 2024. https://ojs.unpkediri.ac.id/index.php/pjk/article/view/15746.