[Rury]

Most animals get tired running very quickly too. A cheetah, just like you, also can't sustain a run at their max speed for very long (about 30 seconds max). But when it comes to endurance, very few animals come close to us thanks to how efficient we are. A lot that comes from us being bipedal, a good amount of our muscles being slow twitch, our ability to breathe independent of our muscle usage while running, and having a very high density of sweat glands across our bodies (10 times the density of chimps) giving us an efficient and superb cooling capacity.

[scns]

> having a very high density of sweat glands across our bodies (10 times the density of chimps) giving us an efficient and superb cooling capacity.

Being naked helps a lot too.