"There was one day when I just didn't feel like I could do weight training after my cardio, so I didn't. You do have to know when to stop, or you can hurt yourself."

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I do 45 minutes of cardio five days a week, because I like to eat. I also try for 45 minutes of muscular structure work, which is toning, realigning and lengthening. If I'm prepping for something or I've been eating a lot of pie, I do two hours a day, six days a week for two weeks.

— Gwyneth Paltrow