Reverse breathing
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Reverse Breathing is a technique, associated with yoga, of by will expanding the abdomen while breathing out through the nose, and then compressing it while inhaling via the mouth -- the opposite of what an abdomen would do during natural, instinctive breathing. Via this process there can be paid especially close attention to that act of breathing. A pure, inner type of thought focus may thus be given rise.
The importance of inhaling or exhaling through a specific opening as stated is unknown.