From Us Weekly: "[Nicole] Richie -- once criticized for her pin-thin frame -- credits her toned, healthy physique to pro Tracy Anderson's Dance Cardio classes. 'When I first came to a class, I heard I was going to be there for an hour and a half. I was like, 'Oh, I don't do that,' the Simple Life star said in 2011. 'And now I'm in there two hours a day, four days a week. It's so fun and the time flies by and the music is great.'"