If cardiac muscle is extremely hard to fatigue, why aren’t our skeletal muscles made of them to give us even better endurance?

Question

I know that the heart is made of cardiac muscle, why supposedly never fatigues or weakens. So why can’t our skeletal muscles also be made of cardiac muscle? It would give us a ton of endurance in life or death situations and make us even better runners to escape from predators.

In: Biology

Answer 1

Also, because our brains evolved over other mammals homo sapiens started to dominate other ‘primates’ with the bodies they had.