TY JOUR TI MECHANISMS OF THE GENERAL STRENGTHENING EFFECT OF VOLLEYBALL TRAINING ON THE BODY OF CHILDREN AGED 9-10 YEARS OLD KW children KW volleyball KW physical development KW physical capabilities KW sports JO Scientific notes of P. F. Lesgaft University AU Zalevskaya, E.N. AU Petrova, M.A. AU Zavalishina, S.Y. AU Rybalkina, Y.S. PY 2023 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft