on your knees? roll out with it until your arms are straight like you're superman and then roll back. it does stress the upper body somewhat. some people just roll it with their arms, which is WRONG@@@@@@@@@@@@@@@@@@@@@@@@@@@@!!!!
... and soon enough you will be the next ross enamait!
I just picked one of these up and I'm wondering what the proper form is. It seems like the way I've been doing it is really tough on the shoulders and not much stress on the lower abs.