Marendra MR, Personi M, Sumantri A. The Effect Of Waist Flexibility Training On Smashing Ability In Extracurricular Volleyball At State High School 10 In Bengkulu City. J. Phys. Educ. Sport [Internet]. 2025 Dec. 30 [cited 2026 Apr. 29];2(2):43-8. Available from: https://jurnalunived.com/index.php/JPES/article/view/1065