http://AskTheTrainer.com/legs-and-butt-exercises.html Personal Trainer Michael Behnken, MS, NASM-CPT-PES, CSCS The stability ball hip extension is meant to be a glute exercise not a lower back exercise. If you do not 'feel' it in your glutes, there is no point to doing it. Regress to an easier exercise. This is a fun way to get some leg and glute work done during lying french press. In this case a body bar is used, but you can use dumbbells too. Make sure when you perform the french press you let it down all the way behind your head, this will involve the long head of the triceps. Perform this one in 2 separate actions. Keep the bar behind your head for a triceps isometric contraction as you perform the hip extension. After you perform the hip extension and hold it for a second perform a french press. Remember you should feel each exercise's target muscles, if you don't your form is off or you may have a posture problem. http://AskTheTrainer.com/posture-problems.html NOTE: Be careful if you have a shirt which is made out of slippery material as you will most likely slip off the ball with this exercise http://AsktheTrainer.com/best-exercises-for-women.html