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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17. Scarlett Johansson
There’s no denying that Scarlett has many scrumptious assets that were clearly seen in He's Just Not That Into You, so what guy wouldn’t want to go running with her? She goes to the gym about three times a week to lift weights and does the elliptical everyday to sculpt and tone her body.
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