00809naa#a2200169#i#450# EN\\bibl\110030 20251223091327.2 1994-4683 20250913b2025####ek#y0engy0150####ca RU Education of flexibility in physical education classes of primary school students 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 Semyannikova Valentina Vladimirovna uchzapiski.lesgaft.spb.ru