Sit in any simple cross-legged position. Shut your eyes. Keep your hands in chin mudra (tips of index and thumb touching lightly). Roll your tongue back, to touch the palate. Keep the upper and lower set of teeth lightly touching, inhale from the mouth. Then hold your breath as you relax everything back to normal at the mouth. Then exhale from the nostril. This is one round. Do up to nine rounds.
Benefits: Keeps you calm. Is said to control hunger and thirst. Controls anxiety and anger. Lowers blood pressure. Used to heal from overheated conditions, including sunstroke or heat exhaustion.
Avoid: Doing this in polluted places, since mouth-breathing is involved.