I used to have Savanna backing up pretty nicely, with her head down, although she'd back kind of slowly. Yesterday I took her on some trails at the new place where I board, and she kind of caught me off guard and jumped into some thick trees, so I stopped her and was trying to back her up and she wouldn't have it. She kept shaking her head and her nose was in the air and her mouth was wide open. Today I rode her in the arena and would walk, stop, attempt to back (sad attempts, at that... she would only take a few steps back and even then she was fighting) and repeat.
I always ask with my hands low, and I gently squeeze the reins and bump with my legs. I want her to back-up somewhat quickly with her neck rounded as opposed to slow baby steps with her nose in the air and her mouth gaping. I have asked her on the ground as well, that's where we started, and she is even pushy in her halter when it comes to backing up.
Anyone have some good techniques on the ground and / or saddle that I can apply? Thanks in advance!