Exercise Instruction:
Lay prone (face down) on a swissball. The ball should rest comfortably under your torso. Put your hands on the ground for balance. Now lift your legs up by squeezing the glutes and surrounding musculature, lower and repeat. If you cannot perform the back extension exercise this exercise will strengthen the same musculature, allowing you to lift the lighter legs rather than the heavier torso. Once the glutes, lowback, and hamstrings are strong enough you can progress to the back extension.