Looking to blast your butt and lower back? Hop on a stability ball, stick your feet against the wall, lift torso and chest up. Hold for seconds at the top — Keep elbows wide and only lower torso to a little past horizontal.
One of the most effective solutions for eliminating chronic low back pain is the (totally free!) regular practice of back-strengthening exercises http://greatist.com/move/exercises-to-help-chronic-back-pain