MSNBCW News Nation January 4, 2013
today, it's lights, cameras, exercise! as ali vincent heads to malibu, california, to see how some of the hottest and fittest celebrities in the world stay in such amazing shape. as the first female winner of the biggest loser, ali vincent is a bit of a celebrity herself. but when it's time to try on a triathlons, stars gone and sweat is on! i think i'm going to puke. ♪ music a triathlon isn't just a race. it's a grueling fitness challenge consisting of a half-mile swim, a 25 mile bike ride and a four mile run. a challenge ali is ready to take on for the seventh time. i've got mom ...