Seriannuari, Fatwa Aulia, Topo Yono, and Ahmad Sulaiman. “Do Exercise for 4 Weeks Using Rubber to Increase the Speed of Gyaku Tsuki Karate Punches Gokasi Karate Athletes Aged 16-20 Years?”. Jurnal SPORTIF : Jurnal Penelitian Pembelajaran 10, no. 3 (December 23, 2024): 390–404. Accessed December 29, 2024. https://ojs.unpkediri.ac.id/index.php/pjk/article/view/23115.