Sinurat, Rodcin Mard, and Imran Akhmad. “Contribution of Double Legs Speed Hops and Pull Down Resistance Bands Training to the 50 Meter Breaststroke Swimming Speed of Male K.U II Athletes at the Medan Aquatic Swimming Club in 2023”. Journal of Indonesian Active in Sports 1, no. 1 (February 24, 2024): 1–12. Accessed April 26, 2025. https://jurnal.unimed.ac.id/2012/index.php/jias/article/view/51719.