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Sure , I haven't got one of those masks , I've just been trying nose breathing on runs.
Maybe I should be more open minded with the Wim Hof stuff as a natural sceptic I moved past the mental / spiritual part and just assumed its only about being able to more efficiently use oxygen and having a higher tolerance for c02
Those weird facemasks to replicate reduced oxygen which gym bros started wearing were proven to do sweet fa
There is a couple of breathing mouthpieces being marketed like the Airofit which have an app to make them seem more legit, I still think the jury is out.
A good friend of mine who is an ex-common wealth rower did a Wim Hof session and said it was brilliant. It's breathing and mental priming which I think are different to just nose breathing.