TY JOUR TI APPLICATION OF SPECIAL BREATHING EXERCISES IN IMPROVING THE FUNCTIONAL STATE OF SCHOOLCHILDREN IN THE POSTKOVID PERIOD KW recovery KW Covid-19 KW functional state KW special breathing exercises JO Scientific notes of P. F. Lesgaft University AU Mishchenko, I.A. AU Flenova, A.R. PY 2025 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft