Kristin Cavallari has managed to keep her slender figure throughout her career as she has gone from star of Laguna Beach and The Hills to jewelry designer - and now skin care guru - with Uncommon James.And on Tuesday the Hills veteran - who will pop up on the fresh incarnation, New Beginnings, opposite ex Brody Jenner - revealed to Byrdie.com what she does to keep her shape.Turns out, her favorite workout is a trend in Hollywood: hot yoga, which is yoga practiced in a very hot room which causes sweating.
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