TY JOUR TI Assessment of the effects of specific high-intensity interval training on physical fitness and work capacity in young boxers KW martial arts KW boxing KW youth sports KW interval training KW physical fitness JO Scientific notes of P. F. Lesgaft University AU Akhmetov, M.D. AU Nizhegorodcev, D.V. AU Osipov, A.Y. AU Guralev, V.M. AU Dvorkin, V.M. PY 2025 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft