The purpose of the random group experimental study was to find out the effect of yogic practices on Physical and Physiological variables among Adolescent School Boys. 30 Adolescent Boys were selected from Chennai, between the age group of 14 and 19 years and they were divided into two groups I, and II with 15 subjects each. It was hypothesized that there would be significant differences among the Adolescent School Boys on Physical and Physiological variables. Preliminary test was taken for two Groups on Physical and Physiological variables before the start of the training program. Group I subjects were given Yogic practices for 45 minutes, 6 days a week for a total period of eight weeks. Group II (Control Group) were in active rest. After the experimental period, the two groups were retested again on the same selected dependent variable. Analysis of co-variance (ANCOVA) was used to find out the significant differences between the experimental group and the control group. The test of significance was fixed at 0.05 level of confidence.