TY JOUR TI Ways to improve the professional skills of hand-to-hand athletes based on a comparative analysis of foreign martial arts schools KW highly qualified athletes KW hand-to-hand combat KW striking KW boxing KW sports training KW professional skills KW hand striking technique KW research JO Vestnik of the St. Petersburg University of the Ministry of Internal Affairs of Russia AU Khybyrtov, R.B. AU Kulikov, M.L. PY 2022 IS 2022 PB SAINT-PETERSBURG UNIVERSITY OF THE MINISTRY OF INTERNAL AFFAIRS OF THE RUSSIAN FEDERATION