TY JOUR TI METHODOLOGY OF FORMING SYNCHRONICITY IN GROUP EXERCISES OF AESTHETIC GYMNASTICS AT THE STAGE OF INITIAL TRAINING KW aesthetic gymnastics KW synchronicity KW integral indicator JO Scientific notes of P. F. Lesgaft University AU Bykasova, E.K. AU Vasyukevich, A.A. AU Zaycev, A.A. AU Pasevina, V.V. PY 2026 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft