The research aims to examine the effectiveness of developing Split Step on specific reactive agility and footwork speed for juniors squash under 15 years, The researchers use experimental methodology with one group design and pre-post measurements, The research sample was chosen in Purposive method, (9) juniors squash registered in the Egyptian Squash Federation 2017-2018, The researchers determine the suggestion training program for developing split step and footwork speed ( 8 weeks by three training units per week), the results of this study were the training program has a positive effect on developing some split step and the training program for developing split step has a positive effect on developing specific reactive agility and footwork speed for juniors squash .