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    Introducing the 'Lucky 7'

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Introducing the 'Lucky 7'

Dr. Sanjay Gupta introduces the 2012 "Lucky 7": our group of viewers taking the Fit Nation triathlon challenge.

Introducing the 'Lucky 7'

Dr. Sanjay Gupta introduces the 2012 "Lucky 7": our group of viewers taking the Fit Nation triathlon challenge.