I’m in the middle of the Ian King Astounding Abs program. Having read part III, I don’t want to move onto that stage until I demonstrate a little more “mastery” of stages 1 & 2. Everything is going as predicted except the “Toes to Sky” exercise. Tain’t workin’. My hips don’t go anywhere near off the floor. I can’t even feel where the strain should be. Any suggestions? If I do the exercise on a bench and grip the bench for leverage, is this defeating the purpose?