I am particularly interested in anyone using a Swiss ball for this sort of workout, as I have access to one here at the school of sport, and quite enjoy using it.
I currently am using it as a balancing point, and using body strength to hold my body pretty much level on top of it (lying down on my front) bit like a see-saw. This works the neck muscles, and the erector spinae (running the length of the back)
I am also doing sit ups to work the abdominals.
Thanks again
Brendon