You ought to come out with a little book, Fun with Fitness Balls and You. I guess with 4 balls you'd have your arms and legs spread out, with hands and feet on top the ball. All the while keeping your stomach off of the ground. Would there be any movement in this, or do you just have to hold that position like a stretch?

__________________
If you hear a voice within you saying that I am not a painter, then by all means paint and that voice will be silenced.