https://www.intermittent-breathing.com/wim-hof-breathing-method-review/
Additionally, the wim hof method puts you at the risk of developing a permanent tinnitus, research it please.
Also see https://normalbreathing.com (Samozdrav Comfort)
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Wow hivesheep, some very interesting stats there on normalbreathing.com - thank you. And the review on the Wim Hof method all made sense to me.
Going to read the author's other article next :D.