00809naa#a2200181#i#450# EN\\bibl\109150 20260204210621.3 1994-4683 20250913b2025####ek#y0engy0150####ca RU APPLICATION OF SPECIAL BREATHING EXERCISES IN IMPROVING THE FUNCTIONAL STATE OF SCHOOLCHILDREN IN THE POSTKOVID PERIOD Journal article Moscow National State University of Physical Education, Sports and Health named after P.F. Lesgaft 2025 3 с. Journal article local Философские и научно-теоретические основы физической культуры и спорта. 796.011 Mishchenko Irina Aleksandrovna Flenova Alexandra Romanovna uchzapiski.lesgaft.spb.ru