Audrina Patridge joined her trainer yesterday for a public workout in LA. She hit Muscle Milk's Fitness Retreat to do some boxing, squats, and time on the exercise ball before treating herself to a pair of complementary sunglasses. Lindsay Lohan showed off her abs and skills at the same spot on Friday and Lo Bosworth also stopped by last week. Audrina's no stranger to showing off her bikini body at pool parties or on the beach shooting The Hills, but she only revealed a little bit of stomach during her afternoon fitness session. All of Audrina's physical activity, though, will come in handy to keep her ready for any two-piece photo ops this Summer.
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