my round off's on the floor have always been the done the wrong way. i add a little more turn than what i should and somehow it gives me power for my tumbling pass. i wasn't exactly taught the correct way from the beginning so i kinda taught myself and it has never given me any problems. but when i did them on the beam i treated it as a total different skill. instead of taking a few powerful steps then a hurdle, i would go into it as a powerful cartwheel and then black and snap my feet down and lift my chest all at the same time. this seemed to work for me and i also teach it this way and it works for my girls also. another coach at my gym tells them to do the round off on the beam just like they would on the floor. i don't really like that because they are too aggressive and kinda get out of control. they have too much power and end up having to take a few steps backwards to stay on or they just fall of all together. also, i think its a little dangerous to have that much power on the beam because you can end up losing control and can get hurt. the round off i'm talking about is where it is done as a single skill and not in a series. i think that a round off in a series, whether it be on the beam or as a dismount, it a different story. good luck with this and i'm sorry if this doesn't help you any... i tried^^