The purpose of the study was to investigate the effect of Extensive Interval training on selected Physical variables of College Athletes. To achieve the purpose of the study, twenty subjects were randomly selected from the B.P.E.S and B.P.Ed Athletes of Noida College of Physical Education, Dhoom Manikpur, G.B Nagar, UP and were divided into two equal groups. Group I (n = 10) acted as control group and Group II (n = 10) acted as experimental group. Group I under gone regular activity and Group II under gone interval training for 8 weeks. The age of the subjects ranged from 18-24 years. Physical fitness variables such as Speed and Strength were selected as criterion variables for the study. The data were collected from both the groups prior to the interval training and after the training period (8 weeks). Analysis of covariance (ANCOVA) was used to find out the significant difference, if any, differences between control and experimental groups on selected Physical variables of College Athletes. The level of confidence was fixed at 0.05 level to test the significance. From the results of the study, it was concluded that there was a significant difference in Speed, whereas there was no significant difference in Muscular Strength between Control and Experimental group of College Athletes.