Objective: This research aimed to study effectiveness of developing specific reactive agility on counterattack of kyorugi juniors in taekwondo. Research procedures: The basic research sample is (10) juniors on whom training program was applied for a period of 6 weeks with 3 training units. All juniors completed the following tests before and after training program: Reactive agility test for taekwondo players (researcher design), physical tests and measuring the effectiveness of counterattack. Data were processed statistically using the following statistical methods: Mean, Standard deviation, Median, Skewness, Mann-Whitney test, Correlation coefficient, T-test of significance of differences, Equation of percentage change. Results: The proposed training program led to the development specific reactive agility variables, where the rates of improvement reached between (5%: 20.51%), physical variables (Strength, Movement speed) and footwork speed, where the rates of improvement reached between (6.16%: 13.81%), and effectiveness of counterattack, where the rates of improvement (29.63%). Recommendations: Researcher recommends the importance of using the proposed training program to develop specific reactive agility for taekwondo players, used specific reactive agility test for taekwondo players when assessing the level of taekwondo players.