TY JOUR TI Study of the influence of various methods of mental self-regulation on the result of competitive activity of triathletes KW mental self-regulation KW self-regulation techniques KW self-organization KW self-mobilization KW triathlon JO Scientific notes of P. F. Lesgaft University AU Pilina, I.B. AU Antipina, Y.V. PY 2025 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft