My son was into him some years ago, but it was in the realm of cold water immersion and not breathwork. I will look up the information on his website.

I had an almost uninterrupted night of sleep and the mouth guard and new mask both work great. Then I did breathing exercises in bed, while still hooked to the BiPAP. And then in the middle of the day I did a 5 minute breathwork session while sitting but hooked up to the BiPAP. With this new comfortable lightweight mask, I actually enjoy how fresh and cool the air is that my BiPAP pushes. The old mask was not comfortable and detracted from the enjoyment of fresh air.