TY JOUR TI EFFECT OF PHYSICAL ACTIVITY ON THE HEALTH AND FUNCTIONAL SYSTEM OF A PERSON KW physical exercises KW physical activity KW functional training KW training KW skeletal muscles KW joints KW heart KW recovery KW health KW stress resistance KW endurance JO Scientific notes of P. F. Lesgaft University AU , .. AU , .. AU , .. PY 2026 IS PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft