Bhastrika pranayama is a very effective breathing exercise of pranayama to control asthma symptoms. Sit comfortably but erect in a meditative posture. Keep the left hand on the left knee in Gyan Mudra. Fold the index and the middle fingers of the right hand to touch the palm. Close the right nostril with the right thumb. Exhale through the left nostril and immediately inhale forcefully. Quickly open the right nostril by closing the left nostril and repeat the procedure. Keep repeating this pattern quickly gradually increasing the speed of inhalation and exhalation. Simultaneously contract and expand the abdominal muscles and slowly return to the initial speed. Very good for the respiratory system including the diaphragm and the bronchial tubes. Improves function of digestive organs.