Episode Detail: Sanjay Gupta, M.D. - Sanjay Gupta, M.D.
Announcing the six CNN Fit Nation participants for 2012's six-month triathlon challenge. They'll join Atlanta radio host Bert Weiss in training for the 2012 Nautica Malibu Triathlon in California. Also: NFL alum Dorsey Levens on his lasting football injuries; 2008 Olympic swimmer Cullen Jones on his fitness regimen and why others should take up swimming.