saw your video..Awesome..When you described starting with a hanging leg raise, to a stability ball with rope crunches, working from the lower ab’s to the upper, is the last excerise basically a vaccume? peace and happy new year.. Michael Tanner nursemike2002@yahoo.com

Well the concept is the same as far as drawing in your abs, but because you are in a prone position the Transverse abdominus is activated more due to your abs pulling against gravity and the fact that you have a posterior rotation in your hips when you squeeze your glutes together.