Fitness guru Jane Fonda is giving up exercise to write a book about the controversy surrounding her days as a Vietnam War peace activist (that led her to be dubbed "Hanoi Jane"). The former Mrs. Ted Turner tells Barbara Walters on tonight's 20/20 that "I feel like, when I exercise, that it keeps things in... It's a very weird thing that's going on in my head." Fonda goes on to say that she and Turner remain friends, and she still has no intention of resuming her film career.