Updated: May 26
I had the please of introducing Pete Evans (www.peteevans.com) to Justin Weiss who is a level II Wim Hof Breathing instructor. The breathing technique not only primes the immune system and alters the default mental patterns many are stuck in chronically. It also decouples the pain protein so stepping into freezing cold water doesn't put your nervous system in a panic response.
Check out This great video from Pete on the interview with Justin, Wim Hof and a cold water plunge.