TY CONF TI JUSTIFICATION OF THE NEED TO CONCRETIZE THE WAYS OF MASTERING COMBINED ELEMENTS IN RHYTHMIC GYMNASTICS KW combined elements KW performance technique KW kinematic characteristics KW competition rules KW rhythmic gymnast JO Scientific research of the SCO countries: synergy and integration AU Suprun, A.A. AU Medvedeva, E.N. AU Chebykina, K.V. PY 2024 PB AUS PUBLISHERS