My instructor also has me shorten my reins a lot when I ride with her. I tend to have too much trust in my horse, and she says if he really wanted to bolt, he could unless my reins are short- so short I almost have to lean forward to keep from pulling on his mouth. But, I ride a green horse =/
Took video but having issues uploading it. Lesson went a lot better.. not running through my aids but something really bothers me about the horse I ride.
For the most part he doesn't accept contact. No matter who is riding him his nose is either in the air or way beyond the vertical. I don't pull him into a frame or anything since that is WRONG but the instructor has me really shorten the reins and focus on keeping him forward (the forward part is good, but the really really short rein isn't...)
I have managed to get him to use his back at the walk (I feel it lift up and swing and he stretches into the contact) but when we trot and canter, we lose it. I know I'm not doing something right but the instructor keeps saying "That's just him"
I'm debating trying a different riding school further away.
The last school master I rode was a pain in the proverbial when it came to canter ais. Instructor told me as I got on him that he could make Her look bad when it came to canter but if you got the aids absolutly spot on he would do it!