Dr. Sanjay Gupta

CNN Fit Nation 6 Pack team member Kas Seerla joins Dr. Sanjay Gupta on his show to talk about the challenges of tackling open-water swimming.

This week CNN is kicking off the 2011 Fit Nation Triathlon Challenge and will announce the six contestants chosen to train and compete with Dr. Sanjay Gupta in the Nautica New York City Triathlon. The following excerpt was taken from the CNN blog "The Chart."

CNN Medical Correspondent Dr. Sanjay Gupta trained for and competed in the 2010 Nautica New York City Triathlon with a group of people looking to get healthy and change their lives, and he's going to do it again in 2011.