The idea is that you build resistance to this particular stressor and, therefore, potentially, you're developing resistance to other stresses as well at the same time. There's also a thing called cold shock protein when you're in hot water. And these things are associated with repair. When you do something like fasting, then again, one of the arguments is why it has been at least in animals and in some human studies, was shown to prolong life. That makes you stronger.

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