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

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

Ultramarathon 

Any long run exceeding 50km

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