TY JOUR TI CONTENT OF THE COACH'S INTERACTION SYSTEM WITH ATHLETES DURING THE TRAINING OF QUALIFIED SWIMMERS IN FINS KW organizational structure KW training process KW content of the system of training qualified swimmers in fins KW coaches JO Scientific notes of P. F. Lesgaft University AU Dudchenko, P.P. PY 2023 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft