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Hmm don't know. I think I've heard people say it can help. Here's one asthma sufferer who seems to dig it: https://www.dangerandplay.com/2015/12/04/wim-hof-breathing-method-video-course-review/

Well I'm sold! If I don't post for a week then we know it didn't work 😉

Also, it's nice to see that I'm not the only one interrupted in videos by cats.

haha, not at all. They are such camera hogs