I certainly think so, particularly if you have access to a coach who knows the discipline. I am an adult "re-rider"- got back into riding after I turned 30-I had ridden a bit of saddle seat and hunt seat as a kid, but the instructor at the barn I liked when I started riding again specialized in dressage, so I relearned riding with a dressage framework. I've loved the emphasis on my seat and body position, as well as thinking about how the horse is using her body in harmony with my body. Is my riding pretty or competition-worthy? I don't think so, but that's mostly because I don't think I'm a naturally talented rider ;) Still, I have a modest set of goals for myself and my horse, and they are all tied to dressage movements and patterns. The concepts make a lot of sense to me, and as far as I can tell, almost everyone agrees that being introduced to the basics of dressage is a good thing for horses of all types, from race horses to Western horses and everything in between.