Transcript for Boston Strong: Brothers' Bond
big day for Boston. The story of two brothers on a journey all their own. Here's ABC's Amy robach. Reporter: They were right there a year ago, brothers and best friends JP and Paul Norden, both from Boston, both construction workers. And on that day, both at the center of the worst tragedy in the city's history. They emerged transformed. Before I would have said I was maybe, like, just content. But now I'm like, happy. On that day, the brothers rushed to different hospitals. They both lost their right leg. Paul was in a coma for a week. Then, two weeks later, this -- Reporter: They spent months in the hospital, between them more than 50 surgeries. But unlike so many, they had a secret weapon --each other. I was like, wow, this is amazing! It was probably if not the best feelin'. Reporter: Never losing that spirit of competition and sense of humor, that makes them brothers. Is there anything you can't do? I haven't like, ran yet or anything like that. They tell me I'll be fine at that. I'll be able to do it but -- Can't beat me at anything either, but -- Reporter: Their bond and resilience a reflection of the city they both love. What do you want people to take away from what happened to this community and what happened to your family? Always have hope because there's a good shot you --everything will be all right. Just don't wait for tragedy to start livin' life or don't wait to say, "Okay, I just lost my leg. Now I'm gonna start doin' all this stuff." Do it now. Reporter: Brothers and Boston strong. So good to have you watching
This transcript has been automatically generated and may not be 100% accurate.