Redbook - 5 Ways You're Doing Ab Exercises Wrong

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"Planks require a lot of focus in order to maintain proper form, because it recruits and activates so many muscles in the body," says Tracy Carlinsky, owner of Brooklyn Bodyburn. While it's tempting to amuse yourself with random thoughts, like what you're making for dinner, the latest celeb gossip, or pretty much anything else but the move you're holding, your form can break down—minimizing the benefits of such a grueling move—when you're not paying attention. Why let your hard work go to waste?