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This study aims to figure out the effect of plyometrics knee tuck jump exercise towards dollyo chagi kick speed of junior Taekwondo athletes at Banjarbaru City. The method of this study is pre-experiment design. The population is all junior taekwondo athletes at Banjarbaru City, they are 12 athletes and become the sample of this study through sampling jenuh technique. The results shows that on pre test dollyo chagi kick speed of junior taekwondo athletes at Banjarbaru City is at the average 19,75 times with standard deviation = 2,094. On post test dollyo chagi kick on junior taekwondo athletes at Banjarbaru City is at the average 22,25 time with standard deviation 1,485. Whereas tcount = 6,966> ttabel(11;0,025) = 2,201or with sig. (2-tailed) = 0,000, it is find out that sig. (2-tailed) = 0.000 <0.05 so tcount is significant. The conclusion is that there is effect of plyometrics knee tuck jump exercise towards dollyo chagi kick speed of junior taekwondo athletes at Banjarbaru City.