I don’t think I could ever do these:

1. Mark Covert has run at least one mile every day since July 23, 1968
2. Xu Zhenjun Ran a Marathon in 3:43… backwards.
3. Three men ran 4000 miles across the Sahara desert in 111 days
4. 7 Days, 7 Continents, 7 Marathons
5. Finish Badwater
6. Dean Karnazes running 350 Miles Non-Stop
7. Ethiopia’s Haile Gebrselassie Marathon World Record Time of 2 hours, 4 minutes, and 26 seconds
8. “Running God” Yiannis Kouros, who ran 303.506 km or 188 miles in 24 hours

Read the whole thing. It provides extra detail that really brings these achievements into perspective.