MAHMUDDIN, M.; D. SIHOMBING, R. S.; YUNIS BANGUN, S.; JOSUA HAMONANGAN, D. The effect of exercise variation methods on leg muscle strength and its contribution to improving volleyball smash results. Jurnal SPORTIF : Jurnal Penelitian Pembelajaran, v. 10, n. 1, p. 126-138, 30 Apr. 2024.