TY JOUR TI THE IMPORTANCE OF RELAXATION TECHNIQUES TO IMPROVE ATHLETIC PERFORMANCE AS EXEMPLIFIED BY RUGBY PLAYERS KW rugby KW relaxation techniques KW stress levels KW breathing exercises KW visualization KW progressive muscle relaxation KW performance KW cognitive function KW injury JO Scientific notes of P. F. Lesgaft University AU Grinchenko, V.S. AU Ibragimov, V.R. AU Lukashevich, R.V. AU Fomichev, V.D. AU Petrenko, Y.S. PY 2023 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft