00918naa#a2200205#i#450# EN\\bibl\99999 20250623210709.1 1994-4683 20250620b2025####ek#y0engy0150####ca RU Study of physical activity among middle school students in China: current status, challenges, and countermeasures Journal article Moscow National State University of Physical Education, Sports and Health named after P.F. Lesgaft 2025 7 с. Journal article local Философские и научно-теоретические основы физической культуры и спорта. 796.011 Общие вопросы физической культуры и спорта. 77.01 grnti Zhang Ge Lavruhina Galina Mihaylovna Pan Jin uchzapiski.lesgaft.spb.ru