TY JOUR TI The effectiveness of jumping activities in the development of physical fitness in children aged 7-11 years KW children 7-11 years old KW physical education and health classes KW physical fitness KW jumping KW fitness JO Scientific notes of P. F. Lesgaft University AU Yakimova, L.A. AU Chernyshov, V.A. AU Peshkov, N.N. AU Makhinova, M.V. AU Chastoyedova, A.Y. PY 2025 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft