Akhmad, Imran, Tarsyad Nugraha, and Petrus Sembiring. 2021. “Speed, Agility, and Quickness (SAQ) Training of the Circuit System: How Does It Affect Kick Speed and Agility of Junior Taekwondo Athletes? ”. Journal Sport Area 6 (2):175-82. https://doi.org/10.25299/sportarea.2021.vol6(2).6433.