Team E.T.A. members Dan Karl, Vic Ventura, Gwen Forti, and myself head out into the winter wilderness of the Adirondack High Peaks, in search of the coldest water we can find. Our mission is to practice submerging ourselves in freezing water in a natural setting. It's a discipline that requires extreme focus, and when practiced in conjunction with controlled breathing exercises can unlock mental and physical benefits that once came naturally to our ancestors.