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Best and Worst Health Trends of 2013

Take a lesson from this year's diet fads, fitness flubs, and expert-approved movements.
hot-yoga

Credit: Getty Images

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Worst: Hot classes

This year, hot Pilates, hot barre, and even hot weightlifting classes have joined Bikram yoga in cranking up the heat. But for what? "You don't need the heat to get a good workout," says diLeonardo. One 2013 American Council on Exercise study found that increasing the temperature does not make you work any harder or burn any more calories. All of the sweat just makes you think you do, all while putting you at risk of dehydration, she says. Also, while the ACE study found that temperatures of up to 95 degrees are safe for a person with zero health issues, researchers warn that many classes turn up the temps as high as 115 degrees.

Next: Worst: Going gluten-free for no reason

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