If it seems as if everyone you know is training for a marathon, you're not alone. The Washington region has more runners than anywhere else in the country. And right now, more people are participating in organized races than ever before. Emily Friedman looks at the economics of road races, and finds out how pounding the pavement can be big business for the D.C. area.
[Music: "Run Around (Karaoke Version)" by Stingray Music (Karaoke) from The Karaoke Channel - In the Style of Blues Traveler - Vol. 1]