Article continues below advertisementSofía Vergara is back to business.The Modern Family star, 53, was hard at work at physical therapy on Wednesday, July 30, after undergoing knee surgery.Article continues below advertisementSource: @sofiavergara/InstagramSofía Vergara is getting back in shape after knee surgery.Vergara laid face down on a table as Marco Milano - a physical therapist at Milano Physical Therapy in Chula Vista, Calif. - assessed her legs. She posed for a mirror selfie, donned in chocolate brown leggings and a matching long-sleeve top, with her backside on full display.