The worst I have seen is that one person was unconscious for 3 minutes. We were doing it with medical staff and they started to get the oxygen masks. Just befor

The worst I have seen is that one person was unconscious for 3 minutes. We were doing it with medical staff and they started to get the oxygen masks. Just before the mask was on he gained consciousness. As far as we all could tell, he didn't have a single issue. This guy could go crazy long without oxygen though, more than 3 minutes and 30 seconds. He was out for almost 7 minutes. I asked the doctors how it could be that he didn't sustain damage. They offered the following conjecture: since we're not in water, you still get some oxygen. So your oxygen count is very low, but not zero. I also have to note that, everyone has been fine with the breathing part of the technique. I have trained 4 people myself, and have seen about 10 others being trained (with doctor supervision). The part where it gets a bit exciting is only during the holding your breath part. I think there's a huge difference in sort of/kinda 'hyperventilating' for 30 breaths (it is slightly different [1]) and then stop breathing at all versus 'hyperventilating' for 20 minutes straight. [1] The bulk of the WHM breathing technique looks like hyperventilating. There is one huge difference though: you breath out as you normally do. In hyperventilation you breath out as fast as possible to breath in again as fast as possible. So the WHM breathing technique, while fast on the in-breath, is on average not super fast because of a normal speed out-breath.