Whenever I do my RO or RO, BHS, backtuck the coach at my gym says I whip my head back and don't use or lift my arms in the back tuck.
He tells me this all the time, but I don't know how to change this or what to focus on.
Also, I'm having a hard time with fulltwists, I can do them pretty consistently on trampolines, but I do them by feel and don't really see where I am in the air. It makes it scary to take it to other things like the tumble track and floor.