500 lb runner has a big message

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Runner Derek Mitchell weighs in at more than 500 pounds, but he's making a commitment to run a 5K once a month.

He running November's race in Knoxville, Tennessee.

Mitchell saying he doesn't just run to get in shape, he's hoping to inspire others to get fit as well.

"Just to show it doesn't matter how big or slow, big or small or fast or slow that you are, that a finish is a finish.  And that no matter how slow you go you are still lapping everybody who is still on the couch."

This past weekend's race was Mitchell's 19th 5K since march.