Can you tell that you are collecting in the correct way?
“There is one way to check that you are on the right way – in the high collection you must be able to stretch them so they follow the bit and they are not stuck up there. In every situation you must be able to stretch them – even in a piaffe or a pirouette, even then, I must be able to do it. Okay if I do it for a longer period of time, they will lose the self carriage and come more on the front legs, but I must be able to do it because 90% of the horses are too short in high collection, they are not really using the back, they come up and short by themselves, and the rider can’t make them longer or deeper.”
Go to a Masterclass with Hubertus Schmidt:
https://www.horsemagazine.com/thm/2020/08/hubertus-schmidt-a-masterpiece-from-a-modern-master/