The purpose of the current study was to determine the effect of circuit training on the cardiovascular endurance. Fifteen male athlete of age group 16-18, from “SAI- Kailash Prkash Stadium Meerut” were randomly selected for a 8 week circuit training programme which was 5 days a week. The selected dependent variable was the performance of participants in Harvard step up test. Pre- and post-test data was collected, on basis which paired sample t-test was applied to identify difference between the groups. The level of significance was set at 0.05. A Significant differences was seen in the pre-post data as the p value obtained (0.028) was less than p<0.05.