Ramadona, Fito, et al. “ The Effect Of Waist Flexibility Training On Smashing Ability In Extracurricular Volleyball Games SMA Negeri 10 Kota Bengkulu”. Multidisciplinary Journals, vol. 3, no. 1, Mar. 2026, pp. 11-14, doi:10.37676/mj.v3i1.1075.