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Ultramarathon 

1.) An insanely bad-ass long run that tests the mental toughness of the world's finest athletes; A supreme test for athletic prowess
2.) the hardest thing a human can do
3.) a run longer than 26.2 miles, although most "ultras" are 50 miles, 100 miles or 100+ miles
"He ran an ultramarathon, you've only climbed Mt. Everest once"

"There are more Harvard Phd's than Ultramarathoners"
Ultramarathon by xtremerunner88 October 13, 2009
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Ultramarathon 

1.) An insanely bad-ass long run that tests the mental toughness of the world's finest athletes; A supreme test for athletic prowess
2.) the hardest thing a human can do
3.) a run longer than 26.2 miles, although most "ultras" are 50 miles, 100 miles or 100+ miles
"He ran an ultramarathon, you've only climbed Mt. Everest once"

"There are more Harvard Phd's than Ultramarathoners"
Ultramarathon by xtremerunner88 October 13, 2009
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Ultramarathon 

John will run an ultramarathon of 100km on Sunday
Ultramarathon by Marosket May 24, 2025

ultra marathon 

1. More than a marathon usually on trails.
2. Running longer than everyone else in the world thinks possible.
Hey want to go get some breakfast?

No im going for a 10 hour ultra marathon... dinner?

screw you
ultra marathon by jaketherunner January 6, 2012