%0 Journal Article %T Training of speed-strength qualities in young football players during the preparatory period at the stage of sports mastery development %A Dmitriev, V.A. %K youth sports, football, speed-strength qualities, jumping exercises %J Scientific notes of P. F. Lesgaft University %D 2025 %N 0 %P 7 %I National State University of Physical Education, Sports and Health named after P.F. Lesgaft