Gaited horses are the way to go for people with back problems. I don't have back problems, I just don't like the bouncing around. And the older you get, the less you like being bounced around. As for walk, trot, canter...well, you can walk, rack, canter. You're just skipping the rough part. :O)
Yeah, it might just have to be that way ... I'll just have to get used to the gaited thing .. hehe