00850naa#a2200205#i#450# EN\\bibl\106286 20260204195342.3 1994-4683 20260129b2026####ek#y0engy0150####ca RU Features of the development of physical qualities in schoolchildren with flatfoot Journal article Moscow National State University of Physical Education, Sports and Health named after P.F. Lesgaft 2026 7 с. Journal article local Философские и научно-теоретические основы физической культуры и спорта. 796.011 Khramtsov Petr Ivanovich Berezina Nadezhda Olegovna Razova Elena Vladimirovna Antonova Elena Vadimovna uchzapiski.lesgaft.spb.ru