TY JOUR TI REDUNDANCY AND INSUFFICIENCY IN PRACTICE CHILDREN 'S AND YOUTH SPORTS KW chosen sport KW novice athletes KW organization and content of the training process KW redundancy and insufficiency KW motor abilities JO Scientific notes of P. F. Lesgaft University AU Ermakov, V.A. AU Leont'eva, M.S. AU Merkulova, I.V. PY 2023 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft