marathoning
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mar·a·thon·er
(măr′ə-thŏn′ər)n.
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.
marathoning
(ˈmærəθənɪŋ)n
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