Most runners have to stop when they reach their lactate threshold, but Dean Karnazes’ muscles never tire: he can run for three days and nights without stopping. What’s his secret?
For those thinking “breed him” – it wouldn’t work. The article said his lactate threshold is determined by his mitochondria, which is inherited maternally. You would have to breed his mom or his sisters, but not him. Additionally, it’s not that he’s immune to getting sore – he just doesn’t feel sore. And it is muscles only, so cardio and everything else is normal.
I’ve heard this sort of thing is common attribute in rowers.