@SarahSon - I wonder if you have the high jump confused with the pole vault? Both of these events require jumping over a bar, but with the high jump, you don't use a pole to help propel you over.
I do understand your fascination with watching them though. I don't see how anybody can do either one of them without getting hurt or landing on their neck.
One of my good friends did compete in the high jump both in high school and college. He was always working on his technique and trying to figure out how to jump higher in each high jump.
Even though there may not be a lot of people who sign up for this event, the competition within the event is quite stiff.