Baby, it's hot outside — but what's a devoted runner to do? "Match your workout to the weather by slowing down during exercise and seeking shade afterward," says Samuel N. Cheuvront, PhD, a research physiologist at the U.S. Army Research Institute of Environmental Medicine. To beat the heat, heed his 411. Pick sunrise or sunset. Your best bet on a hot day is to head out in the early morning or evening, when your shadow is twice as long as you are tall. According to the National Weather Service, exposure to direct sunlight can increase how hot it feels by as many as 15 degrees. Mind the 90-degree line. "When the mercury is above 90 — the temperature of the surface of your skin — you'll gain h
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