TY JOUR TI DESIGN OF A SYSTEM OF CONTROL OF THE LEVEL OF SPECIAL PHYSICAL FITNESS OF ATHLETES IN GROUP EXERCISES IN RHYTHMIC GYMNASTICS KW rhythmic gymnastics KW group exercises KW special physical fitness JO Scientific notes of P. F. Lesgaft University AU Kiviharju, I.V. AU Maksimova, E.V. AU Medvedeva, E.N. AU Sirotina, E.S. PY 2023 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft