Villarejo, D., JD. Belmonte, A. Cejudo, and JLL. Elvira. 2019. “Effects of a PNF Stretching Program on Jumping and Flexibility in Professional Futsal Players”. SPORT TK-EuroAmerican Journal of Sport Sciences 8 (2):35-42. https://doi.org/10.6018/sportk.391731.