In my martial arts school, we learn a stance called Hangetsu stance for use in a bo kata we learn from Isshin-ryu. I became interested in the kata Hangetsu, which we don't learn at my school, because of this stance being featured heavily in the kata. The stance has always felt awkward to me, so I was wondering if the kata could explain its usefulness (I am still confused about it, but that's not the point of this post). While watching this video explaining the movements of Hangetsu, I noticed the instructor really emphasizing the breathing throughout the kata. Particularly at the timestamp 3:20. The breathing is very precise throughout the entire kata, but that spot has a sort of double breath, which I found especially odd. Does anyone know of a practical purpose for the emphasized breathing?