“Six-Months CrossFit Training Improves Metabolic Efficiency in Young Trained Men (Seis Meses de CrossFit Mejora la Eficiencia Metabólica en Jóvenes Entrenados)”. Cultura, Ciencia Y Deporte, vol. 15, no. 45, July 2020, pp. 421-7, https://doi.org/10.12800/ccd.v15i45.1519.