To be fair, though, horses are uniquely good at endurance compared to almost all other non-primate mammals. They have sweat glands all over their body just like humans do.
https://en.wikipedia.org/wiki/Endurance_running_hypothesis
Humans vs horses: https://slate.com/culture/2012/06/long-distance-running-and-...
Cheetahs, wolves : https://www.businessinsider.com/how-humans-evolved-to-be-bes...
We're really good at running.
Animals don't realize that if they just ran 10 miles away they would escape easily. They'll just run far enough away that they can't really see us anymore. Then we find them and chase them again. Eventually they get tired because they sprint away and we conserve our energy.
A horse may be physically capable of running farther than a human, but actually getting them to do that is another thing.