http://AskTheTrainer.com/best-lower-back-exercises.html Personal Trainer Michael Behnken, MS, NASM-CPT-PES, CSCS Stability ball reverse low back extensions are an exercise you should only do if you are advised by a qualified professional. The most important aspect is the contraction of your glutes as your raise your heels up. Your glutes are the prime mover for this exercise. Your lower back is just a stabilizer. If you only feel this in the low back you may have muscle imbalances. These will not rid you of lower back fat, but they will strengthen your lower back. Remember to reiterate for the 10,000,000th time. Resistance exercises DO NOT burn fat off of the muscle you are exercising. http://AskTheTrainer.com/definition-of-percent-body-fat.html