andyjeffries
Senior Master
One of the reasons patterns are done is to demonstrate to the observer / instructor that the technical parameters are being followed.
Audible breathing while not always required is done to show that the breathing is properly coordinated with the movement whichj is a important element of pattern performance. Particularly on this video which was put out by the ITF as a model - not neccessarily a perfect one - no specific critique intended Master Norman for performance.
I'd argue thought that it should be specifically not required. I can't really put in to words why I dislike it. I think breathing should be done properly but I don't need to hear someone sounding like a steam train on every movement to see if they're breathing OK.
I do wonder though whether the breathing is specified per movement in each hyung in the ITF as opposed to the Kukki-Taekwondo's just "breathe properly" is followed.