Santillan Chillambo, Dicson Xavier, and Ramón Alonso Angulo Caicedo. 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.