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One that participates in a marathon, especially a marathon runner.

mar′a·thon′ing n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


the sport of running marathons
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in classic literature ?
She was a regular She-Who-Must-Be-Obeyed, and I want to tell you it chilled me to the marrow, sent those little thrills Marathoning up and down my spinal column, meeting a white woman out there at the head of a tribe of savages a thousand miles the other side of No Man's Land.
"The number of people who have registered at such an early date continues to illustrate the growing popularity of marathoning and is a compliment to the quality of our event," Choate said in early January, adding that the surge in entries "reinforces our belief our race competes on a world stage with races much older and larger than ours."
It was another women's foray into marathoning that had an even larger impact on women's participation.
(Adapted from Advanced Marathoning by Pete Pfitzinger and Scott Douglas, 2001, Human Kinetics, Champaign, IL, $18.95, 237 pp.)