Majid , Sana, and Hoshyar Abdul Rahman. “Exercises Of Explosion Ability For Muscles Of Legs According To Principle Of Moment Push & Effect Of Achievement Long Jump for Juniors”. Journal of Physical Education, vol. 23, no. 4, Dec. 2011, p. 23, https://www.jcope.uobaghdad.edu.iq/index.php/jcope/article/view/1619.