Santillan Chillambo, D. X., & Angulo Caicedo, R. A. (2026). Impact Assessment of a Functional Training Program on Upper Body Strength and Performance of Under-15 Youth Goalkeepers: A Quasi-Experimental Study in Esmeraldas . EKSIGMA Ecuadorian Journal of Scientific Knowledge, 2(1), 82-98. https://eksigma.com/index.php/principal/article/view/20