TY JOUR TI DEVELOPMENT OF STRENGTH QUALITIES AND FLEXIBILITY IN FITNESS AEROBICS KW fitness aerobics KW flexibility KW strength qualities JO Scientific notes of P. F. Lesgaft University AU Bryzgalova, M.V. AU Kaymakchi, L.A. PY 2026 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft