Dakhil, Ehab. “Maximum Special Strength Endurance Training In 400m Youth Hurdles Biomechanical Step Phases and Achievement”. Journal of Physical Education 29, no. 3 (September 28, 2017): 143–155. Accessed May 2, 2024. https://jcope.uobaghdad.edu.iq/index.php/jcope/article/view/198.