S.I. Filimonova, A.S. Grachev, D.E. Egorov, and D.V. Shcherbin. 2023. “Improving the Physical Fitness of Students on the Basis of an Elective Course on the Crossfit System”. Theory and Practice of Physical Culture, no. 6 (July):58-61. http://tpfk.ru/index.php/TPPC/article/view/638.