Plastics
I had a lower body lift and my abs were tightened. But I would think that if the excess skin is removed for a panni, then the exercise would eventually tighten the abs. It's the skin that flaps in the breeze, and that will be gone. But why wouldn't you want the abs tightened. If you do, you never have to do crunches again - that's for the rest of your life! That alone was worth the money to me! :)
"I am not the skin I'm in, but the soul within."