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Stretching Machines

Stretching machines may seem like a relaxing, passive way to get more flexible. But they make it too easy to overstretch, says Ramirez. "The machine does all the work so you can easily strain a muscle or end up with a groin pull."

Safer pick: Yoga

In yoga, you stretch on the ground or the mat and use only your own body weight to stretch. Take a class and hold each pose for 30 seconds or as your yoga instructor recommends.

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