The study was aimed at to find out the effect of yogic exercises on aerobic capacity (Vo2 max) among school boys. To achieve the purpose of the study, thirty school boys (n=30) from Good Shepherd Matriculation Higher Secondary School, Nagercoil were selected as subjects at random. The age category was under 19. All the subjects were divided in to two groups with 15 subjects each as experimental and control group. Group I underwent yogic exercises for a period of six weeks of five days per week and group II acted as control who did not participate in any special training other than the regular routine. Vo2 max was selected as dependent variable and it was tested by using beep test. Pre and post-test random group design was used for this study. The dependent “t” test was applied to determine the difference between the means of two groups. To find out whether there was any significant difference between the experimental and control groups on adjusted post-test means the analysis of covariance was used. To test the level of significant of difference between the means 0.05 level of confidence was fixed. It was concluded that, there was a significant improvement takes place on aerobic capacity (Vo2 max) of school boys due to the effect of six weeks of yogic exercises also, there was a significant difference exists between experimental and control groups on aerobic capacity (Vo2 max).