TY JOUR TI STATIC BALANCE DEVELOPMENT METHOD IN GIRLS ENGAGED IN RHYTHMIC GYMNASTICS AT THE STAGE OF INITIAL TRAINING KW rhythmic gymnastics KW young gymnasts KW balance JO Scientific notes of P. F. Lesgaft University AU Patrina, A.D. AU Shapovalenko, N.S. AU Dzerzhinskaya, L.B. PY 2023 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft