[michael-ax]

EXACTLY! That's why you breathe into a paper-bag (or smoke) to increase CO2 so that the filters open and you get to a point where you feel O2 tingles all over your brain. This is extremely powerful; I practiced that and underwater held-breath swimming and hanging out underwater for a long time to obtain permanent changes that have made me far more effective. Based on work first published by W.Wenger out of a Maryland Think-tank some 50? years ago.

[Etherlord87]

So wim hof method, by breathing a lot, deprives you of oxygen, reducing brain functionality and therefore giving you a drug-like pleasure, whereas recycling air in a bag ends up giving you more oxygen and increasing brain efficiency? May sound like sarcasm, but honestly, do I need a diving gear to test it on myself or is a paper bag enough?

[thatcat]

What kind of changes?

[rybosworld]

I think they are referring to this: https://winwenger.com/books/books-online/two-guaranteed-ways...

"For accumulating 20 hours of held-breath underwater swimming within 3 weeks from start to finish– 10 or more points I.Q. gain; better span of attention; better span of awareness; better awareness of the interrelatedness of things and of ideas and/or perceptions; finding yourself way better at winning arguments or disputes!"

It should go without saying this is nonsense.