Think about -30 degree weather. No window in your bedroom way up there in Canada and doing this after you wake up:
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I literally throw buckets of the coldest water over my body, even on the coldest day in the year, and always with the window wide open. This I call a splash.
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Just the idea is enough to make the civilized 3 square-meal eater shutter.
I think most people can apply ice cold water on their body as I demonstrated in the fasting video a few years ago, but this author made a point to add that he did not start with warm water first, but came directly from bed and applied buckets of ice cold water on his skin. That divides the boys from the men, few could tolerate first contact ice cold water and enjoy it.