Dutchak, M. and Vasilenko, M. N. (2013) “The theoretical substantiation of fitness trainer’s qualifying characteristics”, Pedagogics, psychology, medical-biological problems of physical training and sports, 17(2), pp. 17–21. Available at: https://sportpedagogy.org.ua/index.php/PPS/article/view/583 (Accessed: 8 July 2026).