%0 Journal Article %T PREPARATION OF SCHOOLCHILDREN FOR MIDDLE DISTANCE RUN ON THE BASIS OF RUNNING STEP PARAMETERS OPTIMIZATION %A Alenurov, E.A. %A Rysakova, O.G. %A Konysheva, E.V. %A Ivanov, D.A. %K running technique, kinematic characteristics, middle-distance running, running step parameters, schoolchildren, age characteristics %J Scientific notes of P. F. Lesgaft University %D 2026 %N 0 %P 4 %I National State University of Physical Education, Sports and Health named after P.F. Lesgaft