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1.
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"
by xtremerunner88 October 13, 2009
 
2.
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"
by xtremerunner88 October 13, 2009
 
3.
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
by jaketherunner January 05, 2012