Singer Kelly Clarkson credits CrossFit with helping her shape up and feel confident about her body. "You never work out more than 35 minutes, but it's so intense… It makes me feel like G.I. Jane. It's very empowering," she says about the notoriously tough workout. "I do it totally for my psyche. I'm much better when those endorphins are going. It's a release. And I also love food, so there's a payoff!"
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See which stars turn to this intense workout to stay in amazing shape
See which stars turn to this intense workout to stay in amazing shape.