TY JOUR TI Technology of performing strength exercises by schoolchildren in quasi-isotonic mode in physical education classes KW technology KW physical education KW schoolchildren KW local strength exercises KW quasi-isotonic regime JO Scientific notes of P. F. Lesgaft University AU Kortava, Z.G. AU Zaplatina, N.Y. PY 2025 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft