Whitney Port showed off her gym-honed physique in a black sports bra and matching shorts while exiting a workout class in on Thursday.After working on improving her strength, balance and flexibility, the 37-year-old The Hills: New Beginnings star was seen carrying a yoga mat and a Boxed Water.As she paraded her toned legs on her walk back to her car, the mom-of-one toted a light brown leather tote...