I just started reading up on this a few weeks ago. I got the book by Scott Carny, what doesn't kill us. So far it's a great book. I like things that unleash the raw human potential. Things that our ancestors were fully capable of doing amaze me.
I started breathing more throughout the day especially during workouts. I try and do the breathing exercises when ever I can. The coolest part is I started turning down the heater in my truck and wearing less warm clothing. I hate the cold and would always fight it if I could. After a week I was turning on the cold air in the truck and some days driving with the windows down just to cool off. Winter, for me, is around 0-20 deg. on a warm day. For the cold shower I would slowly turn it to cold at the end of the shower. One day I found myself standing in the cold and no need to turn it off. I was laughing, it felt that good. I even tried running in just shorts in -10. I felt alive. But then I guess that was what got us this far in the world. I feel like I am committed to the Win Hof method 30-40%. I could definitely do more and feel even better.