Audrina Patridge went for a public workout with her trainer in LA this week. She bared her abs as she did squats, boxing and medicine ball work at Muscle Milk's Fitness Retreat. It's a popular spot for celebrity fitness fanatics like Lindsay Lohan and Lo Bosworth. Audrina's newly single following her split from Ryan Cabrera, but she's making new friends with hotties like Glee's Mark Salling, whom she hung out with at an MTV Movie Awards afterparty.
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