TY JOUR TI Motor activity of schoolchildren aged 11-13 years old out of course time KW schoolchildren KW after-hours KW types of physical activity KW harmonious development JO Scientific notes of P. F. Lesgaft University AU Eliseeva, T.A. PY 2025 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft