The research aims to study the effect of public and private Tabata training on the development of some physical and physiological variables for squash juniors under 13 years old. And those registered in the Egyptian Squash Federation for the 2018/2019 season, and the training program lasted 8 weeks, with 3 training units per week. The most important results of the research were that the general and private Tabata training had a positive impact on the development of some physical abilities and aerobic and anaerobic capacities of the squash juniors.