Robby, I think we’re talking more along the same lines than you seem to think.
My initial point was that I don’t think it’s necessary for a US Novice horse to be able to put 10 strides into a 6 stride line. I’d be comfortable if I could ride the poles (set at normal 6) in 5-8 strides on a green horse, provided there was no loss of rhythm/impulsion while making those adjustments. And I put the 5 in there because lengthening is very important too.
But before I did any adjusting work, I’d make sure the horse could work in a comfortable rhythm at the canter. This can take a while for some horses.
As I’ve said before, I’ve done a fair amount of foxhunting, some of it on inexperienced horses. It’s a good way to get the horse going forward in a rhythm. The horse learns to think about what he’s doing, how to keep himself safe, and how to take care of his legs and feet. Most horses, after a spell of hunting, would be very safe to take around a Novice course, not because they have a totally adjustable stride, but because they know how to take care of themselves.
And while you’re jumping around some N courses, you can be working at home on adjusting the canter stride. The pole exercise is a good one, same with gymnastic jumping exercises.
This is what we’re doing with our young TB right now. He did 6 months of trail riding, started jumping in May/June, did 1 jumper show, some hound exercise with the local hunt and 2 N HTs. Maintaining a rhythm is still the most important lesson he’s learning; we work on that first, then add a few adjusting exercises. He’ll do his first T HT next week, then spend the winter doing some proper foxhunting.
Longitudinal adjustments need to be taught by someone who knows how to do it properly. It is not simply pulling the horse back in front. I’ve seen groups of H/Jers do this and it’s just all wrong. It takes a fair amount of riding skill to put 10 good canter strides in a 6 stride line without losing rhythm or impulsion and I think N-level riders can be on their way to learning this (I hope they are) without having to be all the way there yet. A Novice rider needs to learn how to go forward and in a rhythm and stay WITH the horse; until they can do this, they shouldn’t be trying to micromanage.
We haven’t talking about straightness, but I think this is very important for this discussion. We teach horses to hold a line to a pole/fence right from the beginning and do tiny corners, buckets, single hay bales, small bounces, etc. The horse needs to know they have to stay straight and on their line, and the horse has to know that the rider is not going to ask him to deviate from this line – a rider who lets the horse get crooked or gets the horse wiggly is NOT safe even at the lowest levels.