Elizabeth Smart is breaking down her "terrifying" journey to bodybuilding. "I had been in marathon running for quite a long time, and my knee started hurting a little bit more," Smart, 38, said during an interview on CBS Mornings on Monday, May 4. "I'd have to do a whole series of stretches every time before I'd go for a run, and it was taking up so much of my day, and especially on the weekend, when my kids were home, by the time I'd finished my long runs, I'd be useless for the rest of the day. And so, I kind of was taking all these things into account.