The World's Most Talented People

Dean Karnazes

Anyone who has ever taken part in a marathon knows that at some points you have to take a quick break. Yet for Dean Karnazes, something about his muscles allows him to run forever.Normally, the human body gets energy from glucose, which also produces lactate. If the lactate buildup gets to be too much, the body will produce lactic acid, which causes it to shut down. Dean’s body isn’t affected by the lactate buildup, allowing him to never get tired. Dean started running in high school when he joined a track team. While the rest of his team could only do 15 laps, he did 105 before he was told to stop. Since then, he had stopped running completely until he turned 30.