TY JOUR TI DYNAMICS OF DEVELOPMENT OF SPEED ABILITIES AND SPEED IN YOUNG BOXERS ACCORDING TO INDIVIDUAL PSYCHOLOGICAL PECULIARITIES KW special exercises KW speed KW speed abilities KW properties of the nervous system JO Scientific notes of P. F. Lesgaft University AU Demchenko, Y.V. PY 2023 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft