The Effect of Plank Exercise Variations on Arm Muscle Strength in Junior Male Floor Gymnasts Athletes of the FGI Medan in 2025. COMPETITOR: Jurnal Pendidikan Kepelatihan Olahraga, [S. l.], v. 17, n. 3, p. 2780–2791, 2025. DOI: 10.26858/cjpko.v17i3.400. Disponível em: https://competitor.idjournal.eu/index.php/competitor/article/view/400. Acesso em: 8 dec. 2025.