The purpose of the study was to find out the effect of aerobic training on Physical Fitness components of hockey Players. For the purpose of study, 40 subjects were selected from Karnataka. Cardiovascular efficiency was calculated by applying Harvard Step Test. The test was conducted by girl’s high school. Recorded for each and every subject. Cardiovascular efficiency was calculated to measure Physical Fitness of subjects. The descriptive Statistical mean was calculated to measure the cardiovascular efficiency of hockey Players. The result of the study revealed that there was a significant change in the Cardio-Vascular efficiency of cricket players.