I see what your saying, but the thing is i'm not hitting my spine, im hitting my right side beacuse for some reason i can't get it to my left hip, its just i usually finish about at the spine, but never actually on it. do you know what i'm saying? of course i can't see myself roll so im just going on what i feel on my back. but there is no pain in my spine, if there was i would stop
. but yes, i feel like i need more momentem and that i'm not getting it because yeah i might be a bit afraid of the concrete. i can go back to the carpet/grass if thats what you guys think is best though.
Oh, I think I see what you're saying. If you end up at your left hip or near it, and with no bone pain, you're doing fine. Roll on a line on floor/grass and see if you stay on it; if you actually end up on your right hip, your path show be curved to the right (like how a coin rotates in a circle as it's rolling).
Personally, I've been thinking I roll on one side of my back all along, until one day I rolled on wet grass and saw my shirt had water marks across my back.

funny stuff. Try that one day.

EDIT: I forgot to mention this: If you post a video here, it will help tremendously.
