Heidi Pratt and Kim Kardashian
Bauer-Griffin; Dara Kushner/INF
07/10/2009 AT 07:45 PM EDT
recently announced the release of her fitness video The Heidi Workout
. Fellow reality star-turned-fitness guru Kim Kardashian
invites fans to tone up with her Fit in Your Jeans by Friday
series. Who would you rather sweat with?
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