Since Michael Stone first started running, he was hooked. He's done many marathons and 11 Ironman Triathlons all without seeing.
"The brighter things are, the less I see, everything is washed out." said Stone.
Stone was born with vision, but lost his sight over time. He's now legally blind because of a retinal degenerative disease. Last year, he got his guide dog, Wrigley.
"He's pulled me back several times from getting hit by cars on corners of streets, crossing streets," said Stone.
Stone's condition hasn't slowed him down, he's also a sports performance coach, motivational speaker, and he's written a book.
To learn more about Stone's story, visit our Denver sister station KDVR.