Pippa Middleton headed off on another of her usual morning runs today around London. Her route took her down to the Thames River, where she blended in with others on an a.m. exercise kick. She then went home and changed into a green-patterned dress for the commute to work. Pippa seems to have taken up jogging in addition to her now-famous love of Pilates. Pippa Middleton's Pilates teacher, Margot Campbell, just signed a book deal and will soon make Kate Middleton's little sister's fitness secrets available to all.