Rock Center   |  February 08, 2013

How far is too far for tween endurance runners?

Sisters Kaytlynn and Heather Welsch are all-stars in the adult world of endurance running. The girls, 12 and 10, are two of the fastest and youngest endurance runners in the country, often zipping past adults. Their extraordinary talent has left some questioning how far is too far to push such young runners? Kate Snow reports.

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