00877naa#a2200181#i#450# EN\\bibl\109470 20251227182554.6 1994-4683 20250913b2025####ek#y0engy0150####ca RU Technology of performing strength exercises by schoolchildren in quasi-isotonic mode in physical education classes Journal article Moscow National State University of Physical Education, Sports and Health named after P.F. Lesgaft 2025 3 с. Journal article local Методика физического воспитания. Пути и средства физического воспитания. Учебные заведения физической культуры. 796.011.3 Kortava Zhanna Georgievna Zaplatina Natal'ya Yur'evna uchzapiski.lesgaft.spb.ru