Tongue and the root of the tongue is joined by a nerve underneath it. This can be cut off under the supervision of the Guru. Then move the front and lower part of the tongue and pull the tongue slowly with fingers and with a pair of iron tongs as well. By doing this the tongue gradually becomes longer and with the regular practice lengthen it to such an extent that it reaches between the eyebrows. The take the tip of the tongue into the center of the palate (the passage where the nasal tracts and throat meet). There is a place like a pit, which is called Kapal Kuhar. Enter the tongue into this place upwards and look at the center of eyebrows. This is called the Khechari mudra. Those people who practice Khechari Mudra would never feel hunger, thirst, laziness and drowsiness. Diseases and old age never come to them. It prolongs life also.