Bristol Palin,19-year-old has been hard at work, practicing with pro Mark Ballas, and sporting demure workout gear, before making her Dancing with the Stars debut on Sept. 20. She promised to keep things modest — and Bristol Palin is keeping her word, even in dance rehearsal. Though she admits that she doesn’t have much experience in the ballroom, Palin says she “come[s] from an athletic background, so I’m thankful for that. [I played] basketball, volleyball, soccer, everything.” She also vow
