TY JOUR TI PHYSICAL DEVELOPMENT IN THE FORMATION OF THE SELF-STANDING OF YOUNGER STUDENTS IN PHYSICAL EDUCATION LESSONS KW primary school students KW development KW exercises KW standards KW indicators KW model JO Scientific notes of P. F. Lesgaft University AU Troshin, M.Y. PY 2023 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft