KUDRYAVSTSEV, Mikhail et al. The possibility of increasing cadet´ physical fitness level of the educational organizations of the Ministry of internal Affairs of Russia with the help of optimal training effects via crossfit. In Journal of Physical Education and Sport. - Piteşti : Editura Universităţii din Piteşti, 2018. ISSN 2247-8051, 2018, vol. 18, no. 5, pp. 2022-2028. Available on: https://doi.org/10.7752/jpes.2018.s5300.