Marathon records are made to be broken. Runners set their sights on trimming a few seconds off personal bests and elite runners look to break course and world records.

It won't be much different in the L.A. Marathon on March 20, with one different kind of record looking to be eclipsed. One very big record.

Kelly Gneiting, of Ft. Defiance, Ariz., will attempt to break the Guinness World Record for "Heaviest Person to Complete a Marathon." A former U.S. Sumo champion, Gneiting currently weighs 410 pounds.

Gneiting, who says he trains daily, jogs six miles on Saturdays and walks to work, completed the race in 2008 -- when he weighed 430 pounds -- in 11 hours, 52 minutes and 11 seconds. He did not apply for the Guinness record for that race, so the current record of 275 pounds stands.

Guinness stipulates that Gneiting, who is 6 feet tall, has to be filmed the entire 26.2 miles and must be weighed before and after the race for the feat to be recorded.