Oh boy, here we go with the corkscrew. Wendy shows Katie how to use a ball under her hips to help get into the backward tip position. Once the legs come up over the head, they start to circle to one side. This engages the sides of of the abdominals,-the obliques. You complete a whole circle in one direction and then roll back down. Then roll the feet overhead again and complete a circle in the opposite direction. Don't you think corkscrew is a cleaver name?