[manifestsilence]

Not sure about horses specifically, but humans are uniquely adapted to long distance travel among large land animals and used it for hunting by out-performing most other species:

https://en.wikipedia.org/wiki/Persistence_hunting

Edit: it's one of two things I know of that we really excel at besides thinking. The other being accurate throwing, which perhaps explains baseball's enduring appeal:

https://what-if.xkcd.com/44/