Lema-Villalba, K. G., Mocha-Bonilla, J. A., López-Pérez, S., & Villalba-Garzón, G. A. (2021). Massification of combat fitness: A case study in the COVID-19 pandemic stage. Journal of Human Sport and Exercise, 16(4proc), S1609-S1618. https://doi.org/10.14198/jhse.2021.16.Proc4.06