Think walking is a leisurely workout? Think again. The new book "Walk Your Butt Off: Go from Sedendary to Slim in 12 Weeks with This Breakthrough Walking Plan" shows you how to lose wait and become active through walking. We're joined in this episode by one of the book's co-authors, Leslie Bonci, who is the director of sports nutrition at the University of Pittsburgh Medical Center. She counsels clients ranging from individuals struggling to lose weight to scholarship athletes at Pitt who need to eat for better performance.