A challenge has been growing more popular in the past few months for the truly masochistic bicyclists out there: Everesting.
It's riding an elevation of the height of Mount Everest on a bicycle. Pick one hill, and go up and down, over and over again, until you've climbed 29,029 vertical feet.
"It's pretty brutal," says pro cyclist Lachlan Morton.
Morton just broke the record for the amount of time it takes to complete the feat — he finished in seven hours, 29 minutes and 57 seconds. He did it on Saturday on a hill in Rist Canyon, near Fort Collins, Colo.