Frost nip is the first thing that happens, which is sort of a little bit of frostbite. You do it long enough, you lose circulation to the digits or to your skin, and you get frostbite. Dover recommended that runners start out into a headwind and come back into a tailwind. Joggers should also be sure to hydrate in summer or winter. Also, they need to protect the skin, using Vaseline or sun block.
Runners recommend dressing in layers and wearing a windbreaker.
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