[chombier]

For those wondering about the "breathing technique", figure 2 has a link to a movie.

[Arech]

It's very incomplete actually... I've just found this video while navigating through Wim Hof's site - https://www.youtube.com/watch?v=tybOi4hjZFQ It's quite easy to do, btw... I'll try it for some days and see how it going to go...