TY JOUR TI The influence of a differentiated approach and the conditions of conducting classes on the overall endurance of students KW physical education of students KW general endurance KW health groups KW outdoor areas KW differentiated approach KW swimming KW motivation JO Scientific notes of P. F. Lesgaft University AU Nikazachenko, A.L. AU Markova, O.A. PY 2025 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft