Celebrity fitness trainers on Twitter
Pasternak has trained everyone from Lady Gaga to Robert Downey Jr., and has appeared all over TV gracing shows such as Oprah, CNN, Rachel Ray, and more. He's also just recently begun co-hosting "The Revolution" on ABC, a new show that focuses on health, style, mind, and environment. Pasternak's got quiz questions, advice, and more in his twitter stream. Plus, he replies to real people's questions.