“Employing the Plyometric Method in Developing and Improving the Explosive Force of the Lower Extremities The Digital Achievement of Long Jumpers Is a Smaller Category from a Standpoint Athletics Trainers - a Field Study in the Wilaya of Annaba - Algeria”. 2021. Journal of Studies and Researches of Sport Education 31 (4): 159-71. https://www.jou.jsrse.edu.iq/index.php/home/article/view/24.