81-year-old Robert Gralley has completed more than 40 marathons and is not slowing down any time soon.
Bob Becker was 57 before he ran his first marathon and he was running strong until a double whammy threatened to end his running career.
Growing Bolder is all about pursuing passions. And sometimes that means quitting your job as a successful Washington attorney to do what you love best -- running ultramarathons. Find out why Bryon Powell gave up a legal career to run.
Brent Weigner's passion for pushing his body's limits in ultra-marathons has taken him to every continent on the planet, including a race at the North Pole.
365 Marathons in 365 Days
It's an amazing accomplishment to run one marathon, but what if someone ran several marathons in a row? How about 365 days in a row? That's exactly what Belgium runner Stefaan Engels just did. Find out why.
Ed Whitlock, 81, doesn't just break running world records, he smashes them. Fresh off his marathon, during which he broke the world record by 16 minutes, he explains how he's been able to keep running, decades after he first began.
This 52-year-old grandmother of two is now the oldest female to ever compete in NCAA athletics. And just started running six years ago. Find out why she not only returned to college, but tried out for -- and made -- the track team!
Leaving Her Mark, By Hand and Foot
Need proof it's never too late? You'll love Ann Kahl. She got off the couch and started running at age 50. She started a calligraphy business at age 65. Today, she's 80, and you've got to see her to believe her.
On his 32nd birthday, Roy Pirrung started running to lose weight and quit smoking. Nearly 30 years later, he's still running and shattering world records.
What drives an extreme athlete? Find out from Ellyn Brown, a 54-year-old Alaskan who is the U.S. mountain running champ and one of the best snow shoe racers alive.