This topic was discussed before. We can not keep not breathing, the body will start strong muscle movement after a while and do it. (that’s why those who drowned in water or sand, in the lung there is water or sand)
If we sustain not to breath, we can experience this kind of breathing. Before and during this there is very intense internal muscles movement. These movements are very useful for us! For any internal style, not just for Baguaquan!
HeJingHan BaguaQuan, Baguazhang Teaching Taipei.
See more videos at Youtube playlists
some materials could be added from HeJingHan book:
Bagua Quan Foundation Training