WOW. That quote has got to be the most contrary-to-fact quote I have ever heard of!

First off cleaning a stall has nothing to do with a person's riding stills and secondly, not only does scooping poop teach a child responsibility (hmmm, and possibly humility as well hehe) but wouldn't it also give the child that wonderful sense of accomplishment you get after a job well done? I feel great after doing some hard work and would think it's pretty healthy.

No, if I owned a riding school, the students there would most definitely clean their own stalls on a regular basis !