I was lucky enough to ride a nice jumper once or twice about 10 years ago and thought it was good fun but I will be the first to admit I know nothing about hunter/jumpers. These little kids really impressed me. Before a class their trainer would walk them through the course maybe once or twice so they knew where to go -then they were balls out! Fearless kids jumping and hardly any of them went off course. They were good size jumps, in my opinion, and some were riding horses or ponies that have "been there and done that" who might think about refusing, but they would just urge them through or give a tap with a crop. If a horse refused a jump and someone fell off there was no whining and crying.
If/when my husband and I decide to have children, I think I might start them out in Pony Club! Ranch kids are tough too but I was really impressed these kids.