Setup in the hyperextension machine but in a "side down" position instead of the face down position of a back hyperextension. Your feet are firmly planted and your ankle and lower leg sit under the ankle rolls. Put your hands either at your ears, behind your head or across your body. The body is bend downward from the waist. This is the starting position.
Commence the movement by bending the body up from the waist until you have gone as far as you can toward the opposing side.
Squeeze at the maximum contraction point before reversing the body to the starting position.