. >> and i'm livia. here's this week's top story. >> for some of us, running is a sport. for others, it's good exercise. but katie reports on some teens who are using running to help others who are less fortunate. >> it's not often that a race begins with cheerleaders. >> all: hey, greenwich, get fired up! >> runners, set! [ starting pistol fires ] >> but this is not your typical race. it's a community fundraising event. it's organized to a great extent by teens. >> i'm here to help out at save the children, and they're a really remarkable organization. and they raise funds to support different programs -- education, health programs -- all over the world to help children and make them healthier. >> every year in greenwich, connecticut, members of the teen council of save the children put on their running shoes and roll up their sleeves. >> the teens volunteer, and they help along the road, and the teens also run the race. and they help some of the younger children run, as well, and they encourage. and some of the teens are here cheerleading. >> the teens say they voluntee