TY JOUR TI Comparative analysis of technical actions of football players aged 8–15 years in 4×4 and 8×8 game conditions KW youth football KW technical actions KW training process KW simplified game forms KW young football players JO Scientific notes of P. F. Lesgaft University AU Korzhukov, A.V. AU Gillard, M.V. PY 2026 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft