Renée Zellweger goes to the gym six days a week when possible, to log 3 to 5 miles on the treadmill or the elliptical trainer.

"The gym is my therapy. I've got to get stuff out," Zellweger says.

"The perk of going and spending time by myself and getting my head straight and thinking through what might be bothering me is that I get fit. That's not the goal, but it's a nice by-product."

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