TY JOUR TI Analysis of the development of triathlon in the Chelyabinsk region KW triathlon KW organizational and practical recommendations KW development of the sport "triathlon” JO Scientific notes of P. F. Lesgaft University AU Brench, S.V. AU Shakirova, M.V. PY 2025 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft