Iskandar, Risfan, et al. “Increasing Arm Muscle Strength and Power With Dumbbell Exercise Variations”. Jurnal Maenpo : Jurnal Pendidikan Jasmani Kesehatan Dan Rekreasi, vol. 13, no. 1, June 2023, pp. 90-99, doi:10.35194/jm.v13i1.3253.