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, [S. l.], v. 17, n. 2, p. 1792–1800, 2025. DOI: 10.26858/cjpko.v17i2.260. Disponível em: https://competitor.idjournal.eu/index.php/competitor/article/view/260. Acesso em: 24 aug. 2025.