Do you own a horse? No, but I am as much involved with them as if they were my own.
How do they compare to a riding school horse?
Coming straight from a riding school to these, they're a lot more testing and much more sensitive to your aids. More often than not I'm trying to slow them rather than speed them up, as I do with riding school horses. School horses seem to have a 'been there, done that' attitude, even when it's something they enjoy.
Have you ever been bitten/kicked/thrown off a riding school horse?
Yes to all three.
When riding a school horse, do they seem to enjoy being ridden?
I think it is very much dependant on the horse. I know some who could not wait to get out and be ridden, and always seemed energetic and willing to please. But I have rode some who seem to hate it. They don't want to go and they aren't willing to please, mostly the older ones who have been school horses for a long time.
When not being ridden, do the horses seem more relaxed?
Again, this is very much dependant on the horse. Some of them always appear grumpy even when not ridden, but some are just complete attention cravers who do seem relaxed when they're not ridden.
Mount up and leave your troubles behind on the ground.