Stay-cool fitness gear for hot weather

Stay-cool fitness gear for hot weather

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Your 5-mile run feels harder in the summer because it is. "For every degree your internal temperature rises on a scorching day, your heart rate increases by about 10 beats per minute," says Cedric X. Bryant, Ph.D., chief science officer for the American Council on Exercise. A jog now feels more like a sprint as your body desperately produces more sweat in an attempt to cool you off. Thankfully, these products are basically on-the-go air-conditioning. | By Jaclyn Emerick

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