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Extreme cold can cause a drop in body temperature or frostbite. In addition, the wind chill factor poses an additional threat. Both conditions can be extremely dangerous for the exerciser. When the air is still, body heat warms the layer of air surrounding the body. This layer of warm air acts as an insulator, protecting the skin from the colder air. This makes the temperature seem warmer than it actually is. If you are moving, the insulating layer of warm air is no longer there. You feel colder. Adding wind to the temperature results in a wind chill factor or the amount of "coldness". It measures the amount of heat loss. For example, a wind chill factor of minus five indicates that the effects of wind and temperature on exposed flesh are the same as if the air temperature were five degrees below zero even though the actual temperature is much higher.

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