The index and middle fingers should remain on the eye brow center (bhrumadhya) throughout the whole practice.The thumb should be near the right nostril so that it can control the flow of air by pressing the side of the nostril.The third finger should be placed beside the left nostril so that it can control the flow of air in the left nostril.
Close the right nostril with the thumb. Inhale through the left nostril and then exhale through the same nostril.