Two years ago, Steve Knowlton ran 4,000 miles, from Seattle to Key Largo, in 100 days. In about three weeks, the 46-year-old will begin his next challenge. Steve told KARE 11 he plans to run 3,100 miles, from San Francisco to New York City. In order to reach his goal, he'll have to run 70 miles-per-day.
Watch Boyd Huppert's story below: