the.com/ultramarathon

A marathon that got bored of being reasonable and kept going.

means A foot race longer than the traditional 26.2-mile marathon, often stretching to 50K, 100 miles, or beyond.

from Simple carpentry: 'ultra-' (Latin for 'beyond') bolted onto 'marathon' itself — the word that already commemorates the legendary run from Marathon to Athens. So the term is really just 'beyond-beyond-reasonable-distance,' a 20th-century coinage built the moment runners realized 26.2 miles wasn't the limit, just a convenient place to stop naming things.

official start
anything longer than 26.2 miles counts
popular distance
100 miles is a common gold standard
toenails
frequently optional by the finish line
mental shift
pace matters less than refusing to quit
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