Your routine turns on the "brown fat" in your body, which in an adult is mostly in the upper back/shoulder area. The brown fat signals the other fat in your body to thermally warm you up. Babies have alot of brown fat because they haven't developed the ability to shiver. I've read a cold shower like you describe can burn about 50 calories, including the afterburn, and it actually gives a testosterone boost, although somewhat temporary.
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