howdy again friendly-fenxi! well as far as our bull riding here, it was started in the late 1800's during the old Wild West Shows where cowboys would demonstrate their roping and riding abilities but they wanted to draw more attention and excitement so they started riding bulls and that's how it started here.
But hey, they could start a bull leaping event too!
Maybe this is what Carl Jung talks about with certain archetypes, maybe the whole bull leaping/bull riding, is something engraved in our genetic memory or collective-subconscious... Like something that certain daring humans who are around bulls, just spontaneously likes to do for some weird reason...
/FF
haha! well that would be an interesting study to do, I think you should start working on that! But I don't think I would ever spontaneously do bull leaping or riding! lol. but i guess I can't say for sure because I'm not around them!