The Effect of Arm Power Training On Upper Service Ability In Volleyball Games of Extracurricular Students of Palu Salvation Army Christian Junior High School. Compet. J. Pendidik. Kepelatihan Olahraga [Internet]. 2025 Aug. 6 [cited 2025 Aug. 24];17(2):1792-800. Available from: https://competitor.idjournal.eu/index.php/competitor/article/view/260