Abdul Naby, H. and Caliph, E. 2015. The effect of strength training for muscular balance in the development of leg muscles to prevent sprains ankle joint Taekwondo players ages (11-13 years). Journal of Physical Education. 27, 3 (Sep. 2015), 30–43. DOI:https://doi.org/10.37359/JOPE.V27(3)2015.609.