Introduction: Breathing is the most important function in the body but it is the most neglected one. Learning to control the breath allows to control body function. “Pranayama” the breathing practice consisting of conscious inhalation, retention and exhalation is often practiced in conjunction with “Dhyana”(Meditation), and “Asanas“(physical posture). Material and Methods: Present study was a cross sectional study. Fifty (50) normal subject of either sex were selected for the study. They were divided equally in two groups, yoga group A (case) and not practicing yoga group B (control), each comprising of 25 subjects. The blood pressure of the subjects were examined to see the effect of forced nostril breathing on blood pressure by using mercury sphygmomanometer. Statistical Analysis: Collected data was compared and analyzed by student paired ‘t’ test. Results: There was significant decrease in systolic blood pressure in yoga group A (case). There was no significant decrease of diastolic blood pressure in yoga group A (Case). Conclusion: The present study suggest that regular practice of yoga improves cardio–respiratory functions as shown by decrease in SBP and DBP. The Present study revealed that Yoga reduced the sympathetic activity and increased the parasympathetic activity, leading to improvement in vagal tone as shown by decrease in heart rate.