I had trouble when I was learning to twist too. I would get "stuck". I was a gymnast and was taught to "Set. Elbow. Rainbow." (meaning set for the layout, pull your elbow on your twisting side, then pull the other arm over like a rainbow). I would still get stuck. It finally clicked with me when I realized that initiating the twist with my head and shoulders just wouldn't work for me (everyone said "look over your shoulder and your body will follow"...wasn't happening)! So I started keeping hollow and twisting with my hips and THAT worked, for me. It's worth giving it a try and seeing what happens.