Fold the tongue so that the tip of the tongue might touch the upper palate and draw the air through the mouth with a hissing sound C C C C (or Si, Si, Si, Si,). Then retain the breath as long as you can without the feeling of suffocation and then exhale slowly through both nostrils. You can keep the two rows of teeth in contact and then inhale the air through the mouth as before.The practice enhances the beauty of the practitioner and vigour of his body. It removes hunger, thirst, indolence and sleep. His strength will be just like that of Indra. He becomes the Lord of Yogins. He is able to do and undo things. He becomes an independent monarch. He becomes invincible. No injury will affect him. When you are thirsty, practise this. You will be relieved of thirst immediately.