Brooke Voss says no visual impairment or any other illness will stop her from running a marathon.
"You get hungry for it. You want more, you want to see if you can beat your best time," Voss said.
Voss, 34, and her marathon guide, Colleen Venti are training for the upcoming PF Changs Marathon.
"It makes me feel good to help someone else have the same experience that I've had," Venti said.
For years, Venti has been Voss' guide.
"Basically my optic nerves never finished developing. My eyes work find but my brain doesn't take most of the data my eyes take in," Voss said.
But that doesn't stop Voss.
"I'm just inspired by her. I just don't know of other people who are visually impaired (that) would choose running as their first sport," Venti said.
Voss said she took up running on her treadmill to stay active after she lost her job when the recession first hit. Now, about 12 or so half marathons, 5Ks and marathons later, she's qualified for the big one in Boston.
"I received some good words of advice along the way: get comfortable being uncomfortable," Voss said.
Voss said the hardest part isn't her blindness - it's making sure she's got enough energy, nutrients and water to finish off her best time.
"My goal at Boston is to break four hours, even if it is 3:59:58, I'd be a happy girl," Voss said.
Voss said her favorite part of Sunday's half marathon in the Valley is the music along the way.
Copyright 2013 CBS 5 (KPHO Broadcasting Corporation). All rights reserved.
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