Super Dean Karnazes:

Californian superhuman Dean Karnazes, the Superman of his time, an athlete born in 1962. Dean can run hundreds of kilometers without stopping, and yet his muscles do not tear!! - In 2005, he ran for 80 hours (more than 3 days) without stopping or sleeping, covering 560 km, and in one of the challenges he ran 4,800 km in 75 days. He only stopped to sleep and eat, so he never got tired, says “Dean” about his achievement. The first: “Honestly, nothing stopped me except sleepiness. The time I ran for 3 days, it was crazy. I ran a lot while asleep.” The scientific reason for this is that he suffers from a rare disease that allows his body to expel lactic acid from his system immediately before it accumulates in his muscles.