Mahmuddin, Mahmuddin, R. Syaifullah D. Sihombing, Sabaruddin Yunis Bangun, and Dian Josua Hamonangan. “The Effect of Exercise Variation Methods on Leg Muscle Strength and Its Contribution to Improving Volleyball Smash Results”. Jurnal SPORTIF : Jurnal Penelitian Pembelajaran 10, no. 1 (April 30, 2024): 126–138. Accessed December 22, 2024. https://ojs.unpkediri.ac.id/index.php/pjk/article/view/22242.