[1] It consists of compressing the abdomen while inhaling through the mouth, and expanding it while exhaling through the nose.
[1] Practitioners believe that consciously controlling this movement in a way opposite to normal breathing can build up qi for various applications.
[1] The technique is practiced in martial arts including baguazhang, tai chi and other styles of kung fu.
Expanding the abdomen while delivering a technique (e.g. punch) can also protect the inner organs from a received counterattack.
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