Of all mudras, Kechari is one of the most important, and unfortunately, it is also one of the most difficult. By joining the tip of the tongue to the uvula, or with certain nerves in the nasal passages, Kechari Mudra creates a cycle of energy in the head which generates a magnetic field that draws energy upward from the body and from the base of the spine to the brain. The assumption of this mudra helps to hasten the advent of deep spiritual states of consciousness.

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Please read this blog by Nayaswami Devarshi