You've heard of people who like a challenge - maybe you're one of those people yourself - but sometimes said challenge can sound extreme, reckless, dangerous, ... and a variety of other adjectives or expletives. Running a marathon through the Everest, Earth's highest mountain, is one such example. But yes, some people do it. The average human struggles to even breath the air up there unassisted, which perhaps should give us pause to suspect those people aren't human at all...
More information:
redbull.com/gb-en/the-everest-marathon