I'm very choosy about who gets to ride my horse...So was his previous owner, so I hear. He's very picky himself, so it's not like I don't have a foundation for this. In the right hands, he can do whatever you want, but I've seen him with his nose in the air and his back hollow from the one time I let a friend ride him, and it was not a pleasant sight. Apart from her, trainers have been the only other people who've ridden him. I'll probably let another one of my friends ride him soon, because she asked, but she's been riding longer than I have, so I feel he'll do fine with her.
I guess I'm so protective of Frosty because of how much training I've put into him. It makes me nervous to even think about someone inexperienced riding him, because I know he tends to test people (nothing serious, don't worry), and I don't want someone to get hurt or frightened and then upset him more and it just become some huge mess. Maybe I'm paranoid, I dunno.