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You likely remember the part of "Forest Gump" where the titular character ran across the United States just because he felt like it. It seems rather insane, like most of the things Tom Hanks' character was able to accomplish throughout that film.
But in reality, many people have actually accomplished the cross-country jog. One of the first to complete the feat was Boston's Dave McGillivray, who needed 80 days to run 3,452 miles from Oregon to Boston -- an average of 45 miles per day. On the final leg of his run in 1978, McGillivray ran through one of the garage doors in the outfield of Fenway Park and took a few laps around the stadium as the crowd roared.