The present study attempted to investigate the effect of circuit training on agility and speed variables. The design of this research was quasi experimental method. Thirty five male students of Damot secondary school aged 16-17 years had divided randomly into 2 equal groups. Both the exercise group (n = 18) and control group (n = 17) participated in the typical 1 classes of 40-minute Physical education per week in schools, but only participated in additional 2 sessions per week of 60 minutes per session of exercise training, which comprised as 60 meter run, and agility illusion test. Both groups had taken pretest and posttesting and only thirty five the subjects participated in speed and agility tests: agility was measured using agility illusion test and speed was by 60 meter speed test. The collected data was analyzed using statistical method Analysis of independent sample t-test with level of significant 0.05. The results showed circuit training significantly improved speed and agility in at p>0.05. Therefore this research confirmed as twelve week circuit training could improve the agility and speed of high school students. Hence the allocated physical education period in Ethiopian education system is very low and high school students should get additional times to improve their fitness and health.