People always ask how cold to make the ice bath. What you need is the release of something called dinorphin, which makes us feel good. It's also the terrible effect that alcoholics feel when they are in withdrawal. When you do that, a number of things happen. You set off heat shock proteins that go repair broken proteins and misfolded proteins. And later endorphin binds its receptor more strongly. So when you have this uncomfortable experience in the heat,. you literally feel better in real life when pleasurable vents come on when you experience them.

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