Sobko , Iryna, Sergej Kovalenko, and Kseniia Tsyhankova. “Using the Method of Circuit Training in the Gym in the Training Process of Volleyball Players of 14-15 Years Old”. Sports games, no. 4 (26) (March 27, 2023): 40–52. Accessed July 17, 2024. https://journals.uran.ua/sports_games/article/view/276135.