M. Hassan and A. Haitham, “The Effect Of Special Exercises On Learning Hurdle Clearing And The Rhythmic Triple Step Of 100m Hurdles Aged 14 – 15 Years Old”, jope, vol. 30, no. 1, pp. 111–131, Mar. 2018, doi: 10.37359/JOPE.V30(1)2018.323.