Our bodies have a very good system of heating and moistening air. Unless temperatures are well below 0 degrees, there is absolutely no danger in running in the cold. The burning sensation some people feel while running in frigid temperatures is a harmless nervous response. Just like when you eat something cold and it hurts your teeth, when you breathe cold air, your throat may sting. The discomfort won’t cause any damage, and the air will warm up by the time it reaches your lungs.
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