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 June 10, 2026. https://www.revistaretos.org/index.php/retos/article/view/109388.