If Jon Kitna was able to sign with the Dallas Cowboys as an emergency starting quarterback in 2013, another name showed Monday that he's ready to answer the call if another team is in dire straits:

Doug Flutie.

The 51-year-old and 12-year NFL quarterback ran the Boston Marathon in a time of five hours, 23 minutes and 24 seconds on Monday. What makes the feat so impressive is that Flutie didn't decide to run the marathon until Saturday morning, according to Boston.com.

He tweeted a photo of his Boston Marathon number as proof that he had entered. Flutie's decision helped his Doug Flutie Jr. Foundation for Autism raise $176,463 for the cause, in which a team or runners raised that sum collectively.

But for a 51-year-old man to decide to run more than 26 miles on a whim and finish it is pretty impressive.

Flutie played professional football for 21 years, spanning three leagues. A Heisman Trophy winner out of Boston College in 1984, Flutie joined the New Jersey Generals of the USFL in 1985. He spent the next four years in the NFL as a backup and then became one of the most successful quarterback in Canadian Football League history from 1990-98.

That earned Flutie a trip back to the NFL, where he spent eight more seasons with the Buffalo Bills, San Diego Chargers and New England Patriots before retiring after the 2005 season.

Bustedcoverage.com was so impressed with Flutie's run that it posed the question:

"Who would you take right now as a backup NFL quarterback: (Dallas Cowboys backup) Brandon Weeden or Doug Flutie?

"This guy showed up to the Boston Marathon today looking like he could run an offense right now. There is no way you'd take Weeden over Doug Flutie."

What do you think of Flutie's feat of completing the Boston Marathon after deciding to run in it just 48 hours earlier? Comment below or tell us @SportsWN.