So i've just recently gotten back into riding within the last several months, after putting my horse down last year, and i've been having trouble staying still at the canter. I never had a problem on my old horse, he had pretty smooth movement(he was a quarter horse). I ride English, in a general all-purpose saddle, no changes in that from last year.
The horse i'm taking lessons on is an arabian, he's a little taller and leggier than my old horse, and his gaits are just so much bigger and more elevated. When I ask for a canter I tend to bounce and feel myself wanting to go into a half seat just to stay still. I thought the problem would disappear after building back some of the muscle i'd lost, and it has lessened but i'm still bouncy.
When I ask for the canter from a walk or a halt, I usually get a much more collected response and it takes less time for me to stay still, but especially asking from a posting trot, I end up going for quite a few strides before I can collect enough to have a quiet seat.
Does anyone have any advice to either build up more muscle to allow me to control my body more, a different way of sitting, or any sort of tip?