I am a self taught rider who has only had one formal lesson (see my latest posts for videos). I know just about every detail on how to ride, it's just a matter of practice (which is much more difficult since selling my horse).
I am completely confused on this part of leg ques though. Basically, you push your horse the direction you want to go (or I guess that there are two methods, I'm talking about the one where the horse moves off pressure, rather than into pressure), right?
If you want a right turn on the forehand, you would "push" slightly ahead of the girth on the left side. For a right turn on the haunches, you would push slightly behind the girth on the left side. To side pass, you put pressure directly on the girth (please correct me if I am wrong, I have heard 10 different ways to do this, when everyone seems consistent in ideas for the other ques).
My confusion is when I watch riding videos (pro and amateur), there is no significant leg movement from the rider when asking for turns. Everything seems to come from slightly behind the girth. Even if it is a "fine-tuned" horse, how can a horse know the difference between a few millimeters? The way I see it, there would have to be significant leg movement from the rider for the horse to see a difference, which I only see in bad riding videos.