Nothing would motivate a morning cardio workout more than running side by side with a hot female celebrity, like Jessica Alba, Kate Upton, or Scarlett Johansson.
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20. Jessica Biel
Believe it or not, Jessica was the tomboy on 7th Heaven (who would have thought?). Biel takes to the great outdoors in order to stay fit. She works out by hiking, rafting, and snowboarding. She does hours of cardio at the gym, so good luck trying to keep up with her if you go running with this hot chick.
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