2025. The Effect of Arm Power Training On Upper Service Ability In Volleyball Games of Extracurricular Students of Palu Salvation Army Christian Junior High School. COMPETITOR: Jurnal Pendidikan Kepelatihan Olahraga. 17, 2 (Aug. 2025), 1792–1800. DOI:https://doi.org/10.26858/cjpko.v17i2.260.