Krugovykh, Ilya, Vitaliy Avsiyevich, Zhanna Sabyrbek, Toktassyn Bekbolatov, and Sharkul Taubayeva. “Análisis Comparativo De Los Sistemas De formación De Entrenadores De Fitness”. Retos 62 (January 1, 2025): 553–563. Accessed December 17, 2025. http://207.180.252.49/index.php/retos/article/view/109388.