You can't really increase your body temperature that much before your brain starts to cook, and other organs start to cook. The appropriate surfaces in this case are the upper cheeks, or i would say the upper half of the face, the palms of your hands, the bottoms of your feet. There are a number of different reasons to use deliberate cold exposure for mental performance. I'll give you some at home methods to do this, either in the gin or on runs, or for sake of cognitive work.

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