PORTLAND -- A Colorado man took distance running to a new level over the Fourth of July holiday in metro Portland.

David Knapp ran three marathons.

He started with the Foot Traffic Marathon on Sauvie Island Friday, then the Stars and Stripes Marathon on Saturday in Beaverton and finished his triple with the Cook Park Marathon on Sunday.

Knapp has a big goal in mind for this year.

I'm running 50 marathons to celebrate turning 50 this year and to raise $50,000 for the Alzheimer s Association.

He lost his mother to Alzheimer s in 2001 and thought running the marathons would be a way to raise money and awareness.

He says people are often surprised by what he's doing but he reminds them of something very important.

You may know a cancer survivor, a stroke survivor or a heart attack survivor, he pointed out, but you don't known an Alzheimer's survivor because there aren't any.

His goal is to finish the 50 marathons by the end of November. He's able to do this in part because he runs far slower than a race pace, leaving his ego at the starting line.

If you'd like to learn more about what Knapp is doing you check out his Chasing Windmills Facebook page.

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