The aim of the random group experimental research was to figure out the impact of yogic practices on teenage stressed girls' body mass index (BMI) and stress. For the purpose of the study, 30 stressed adolescent girls were chosen randomly using random sampling group method They came from Chennai between the ages of 14 and 18, and were split into two classes, I and II, each with 15 subjects. It was hypothesized that there will be substantial variations in physiological and psychological factors such as Body Mass Index (BMI) and Depression in the teenage depressed girls than in the control group. Preliminary test was conducted for two Groups on Body Mass Index (BMI) and Stress before the start of the training program. Group I subjects were given Yogic practices for 60 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 dependent variables. Covariance analysis (ANCOVA) was used to assess the relevant distinctions between the experimental group and the control group. The significance test was set at a degree of trust of 0.05. The results of the study proved that the Experimental Group showed significant differences on selected physiological and psychological variables such as Body Mass Index (BMI) and Stress than the Control Group due to Yogic practices among adolescent stressed girls. The theory was agreed at a confidence level of 0.05. Therefore it is concluded that teenage girls benefit from Yogic activities to sustain a balanced Body Mass Index (BMI) and to overcome stress.