At 72-years-old, Bob Becker estimates he's run about 20,000 miles in his lifetime.
He's conquered the Boston Marathon and several ultra-marathons. An ultra-marathon is any race that is longer than a standard, 26.2-mile marathon.
In 2015, he spent his 70th birthday running the prestigious Badwater Double, a 292-mile run through Death Valley. Before Becker, the oldest person to complete the Badwater Double was 57 years old.
"I'm a little bit unusual at my age, doing these things," he said. "I’m told frequently that I inspire a lot of people to get off the sofa and get out there and exercise. And that's a big deal to me."
From Morocco to China, his running has brought him to different corners of the world.
Becker is also the founder of the Keys100, the biggest ultra-marathon in Florida. Keys100 will hold its 10th annual race later this month.
"[I’m] very proud of the race," he said. "Not only has it been wonderful to see the sport grow, but we raise a lot of money for the Cancer Foundation of the Florida Keys, which is our charity of choice."
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The Cancer Foundation of the Florida Keys has personal symbolism to Becker, who conquered prostate cancer over a decade ago. His experience with cancer, he said, gave him a "new appreciation for life."
Becker said he's slowing down, only doing three or four races a year, but he plans to keep running for "the foreseeable future."
This year's Keys100 ultra-marathon will take place May 20 and May 21. To register for the ultra-marathon, go to Keys100.com.