TY JOUR TI DEVELOPMENT OF CONCENTRATION OF ATTENTION BY MEANS OF NEURODYNAMIC GYMNASTICS IN YOUNG CHESS PLAYERS 7-9 YEARS OLD KW neurodynamic gymnastics KW means of attention development KW chess sport KW children's sport JO Scientific notes of P. F. Lesgaft University AU Aleksandrova, V.A. AU Skotnikova, A.V. AU Bykovskaya, D.F. AU Serikova, Y.N. PY 2023 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft