2025. 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. 17, 3 (Oct. 2025), 2780–2791. DOI:https://doi.org/10.26858/cjpko.v17i3.400.