maan gareeb, “The Effect of Standardized Fartlek Training Using Resistance To Develop Speed Endurance In Youth Cyclists”, jope, vol. 22, no. 4, p. 24, Dec. 2010, Accessed: Jul. 08, 2026. [Online]. Available: https://www.jcope.uobaghdad.edu.iq/index.php/jcope/article/view/1697