so, my trainer's always told me that my one equitation fault is that i never have my shoulders back. and i've never really been able to do it. i find it uncomfortable to keep them back, so when i do&stop paying attention to that (to pay attention to the horse), they always go forward. i've seen a "shoulders back" thing in a magazine that's supposed to help with it, but it's 50$ and i wouldn't use it in shows. is there any other way to get over the habit of not keeping my shoulders back? thanks in advance!