I have today discovered a whole new swimming technical device... to help you "feel" your roll.
It works at least when swimming in a wetsuit anyway.
It is quite simple.
You fart whilst swimming, and the gas bubble then rolls around the inside of your wettie and you can feel it rolling across your back etc.
If you can feel it on your hip as you roll, then you know you are getting a good roll - if it doesn't move much past the small of your back then you know you are not rolling enough (for long, o/water catch up type style swimming anyway).
Hope this helps peeps
Didds (R)Roll-a-pop