Santillan Chillambo DX, Angulo Caicedo RA. 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 [Internet]. 2026 Jan. 15 [cited 2026 Apr. 16];2(1):82-98. Available from: https://eksigma.com/index.php/principal/article/view/20