“…In the middle and the end of the 20th century in our country (Shterev, 1975), (Petkova and Kvartirnikova, 1985), (Slanchev, 1992), (Rachev, 1968) studied the problems of physical fitness. In recent years, studies on physical fitness have been conducted by (Marinov, 2020), (Marinov, Georgieva, Alipieva, 2019), (Borisov et al, 2019), (Nancheva, 2019), (Nancheva and Naydenova, 2019), (Miladinov and Konchev, 2019).…”