It took Marshall Ulrich 29 years to get off the couch and go for a run. But he hasn't stopped hitting the trail since. He's run more than 10,000 miles through ultra-marathon races and has gone to the top of his game.

When Ulrich turned 29, he became the first person to run six 100-mile races in one season, and finished in the top 10 in half of them! He's also climbed to the top of each of the seven summits around the world and made his way across Death Valley more times than anyone else. 

Ulrich, who is one of only three people to compete in 12 adventure races, has vowed to every year complete something no one else has. He's already the only person to finish the Triple Crown of Extreme Sports. 

He talks with Growing Bolder about what life is like after turning 50. 

Sports - Extreme, GB Topics, GB Topics - Sports Stars, GB Exclusives - GB Radio Show

marathon - adventure racing - extreme - summit - trail - climb - death valley - extreme sports - ultra-marathon - seven summits