Practice of Khechari Mudra is Lambika Yoga. The technique of the Mudra is explained below. He who practises this Mudra will have neither hunger nor thirst. He can walk in the sky. This Yoga is beset with difficulties.
This is a very difficult Yoga. It has to be learnt under a developed Yogi Guru who has practised this Yoga for a long time and attained full success.
It is kept secret by Yogis. It confers great Siddhis or powers. It is a great help to control the mind.
He who has attained success in this Mudra, will have neither hunger nor thirst. He can control his Prana quite easily.
Khechari Mudra, Yoni Mudra or Shanmukhi Mudra, Sambhavi Mudra, Asvini Mudra, Maha Mudra and Yoga Mudra are the important Mudras. Among these Mudras, Khechari Mudra is the foremost. It is the king of the Mudras. Mudra means a seal. It puts a seal to the mind and Prana. Mind and Prana come under the control of a Yogi....He who has purity and other divine virtues, who is free from desire, greed and lust, who is endowed with dispassion, discrimination and strong aspiration or longing for liberation will be benefited by the practice of this Mudra.