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reporter: diagnosed with a degenerative eye condition when seven, the colorado runner lost his sight in his late 20s. the sense of disability was starting to really weigh on me, so si signed up for a half marathon and started training for it. just getting out there to run changed my world. reporter: his challenges soon took the 51-year-old around the world. he climbed match uma chu pi ch, kilimanjaro. what does running mean to you? it s a sense of freedom, a way to mind ability in the face of a disability. reporter: he hopes to instill confidence in young people. try to see the possibilities to destroy the notions of what somebody who s blind is capable of doing. reporter: this is berlin s seventh boston marathon but first with daughter talia by his side. if you were to sum up this ex plerns altogether, what would you say? can you combine elated and exhausted? reporter: and ready for hisrv ....