The cooling breath cools the body and calms the mind.
Roll the tongue into a tube (as best as you can) and stick the tip of the tongue out of the mouth. Inhale through the tongue and hold the breath in for 4-5 seconds with the chin pressed against the chest. Exhale using Ujjayi Pranayama through the nose. Repeat 5-10 times.
Use this pranayama only if there is obvious excess heat in the body. Do not use if the body feels cold, and practice with caution in wintertime.