A suddenly, startlingly thin Sarah Palin is fattening up her bank account with her latest endeavor: a fitness book. The incredible shrinking Sarah aims to involve the entire fam in the project. "Our family is writing a book on fitness and self-discipline focusing on where we get our energy and balance as we still eat our beloved homemade comfort foods," she tells People magazine. "We promise you: What we do works." Palin has crowed in the past about her low-carb diet spiced up with her favorite "moose chili" treat.