“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, vol. 17, no. 3, Oct. 2025, pp. 2780-91, https://doi.org/10.26858/cjpko.v17i3.400.