Pippa Middleton ran her heart out at the end of a triathlon in Woodstock, England, today. She collected her medal and chatted with her pals after crossing the finish line. It isn't her first time competing in the GE Blenheim Triathlon, and the impressive feat of athleticism is just part of how Pippa tones that very famous backside. While she was having a very fit morning, much of her family, including parents James and Carole, sister Kate Middleton, and Prince William, were at the races to watch the Epsom Derby. It's hard to imagine that Pippa had much time to train for this event, since she was busy with her sister's royal wedding and has since been getting back to work. She also took a trip to the French Open with friends, where her style and love life were once again the center of attention.