His mother has been his ultra-running role model all along.
One newly minted minimalist shares his thoughts on the subject.
One doctor thinks humans have always been pushing the limits.
He ran in honor of his father and brother.
He won two marathons in two days.
It was his second attempt to be the first person to complete the feat.
The extreme ultra mud race is about as dangerous as they come.
They were awarded with special pins by the National Parks Service.
She fell through an ice bridge into a freezing creek.
The annual Welsh race started out as a bet between a pub owner and a hunter.