I actually went and met Wim. I took one of his seminars. He had us all go outside into a pool of ice together for about ~1 minute with all of us chanting who let the dogs out while we froze. I walked out completely red because it was the coldest thing I'd ever done. At that point I was doing cold showers for about a year and a half.

I am a very physical person and his method was the first one to put my mind into a meditative state. You actually feel it in your body and shock it which silences your regular thoughts. You only focus on your breathing and how you feel in that moment. It gives me a really quick reprieve when working on a difficult problem.

You have people that take his method to extremes though, I remember one guy at the seminar literally pissed himself from holding in too long. It can make it all seem like pseudoscience. I can confirm that it has a very physical effect on my body and helps me meditate a lot easier.

A side effect of the ice training is that I sweat in really cold weather. I live in Seattle and people look at me funny cause I'm rocking a t-shirt and shorts but if I wear a jacket I'm boiling.