How do you teach a young horse to trot in neck extension?

*a full neck extension like a old horse
I'm trying to have a great impulse and energy and the top of the head upper than the withers. From that i teach the horse to follow my hands by advancing one hand and the other one by one until he shoot downward. When the automatisms are learned you can wonder
I'm trying to get mine to do that too, I get her really tired after riding for awhile and then I trot her on a long rein so she can stretch out, make sure the trot isn't too quick :)
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