Know this: “You’ll be able to comfortably work out longer and harder if you’re cool,” says Len Kravitz, PhD, coordinator of exercise science at the University of New Mexico. “Being too hot stresses your body out, so you don’t perform as well.” Translation: You burn less fat.

Do this: When exercising at home, put a fan in front of your workout area. Hitting the gym? Wait to use the treadmill that has a fan built into the console.
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