Some days I am happy to have a green horse and all I have to do is ride stirrupless (or with one stirrup).
I remember these exercises all to well. When I took group lessons as a kid we also played musical horses during these exercises so you learned how to ride each mount without hands, stirrups or sight. It really taught you judgement of stride on any horse.
I still credit the trainer who had me do this for the rider I am today. Even if in my younger days I cursed her name after an hour without stirrups.
If your horse says no, you either asked the wrong question or asked the question wrong
And God took a handful of southerly wind, blew His breath over it and created the horse