Attach two light bands to a low anchor point. Facing away from the anchor point, get into a Lying position on the floor and grip the handles with the palms facing away from the anchor point. Add an appropriate amount of tension in the bands and begin the exercise with your arms extended toward the feet, holding your heels off the ground and maintaining the "hollow" shape with your torso. Perform the exercise by bringing one hand into the rib cage area by bending at the elbow and retracting the shoulders, while leaving one arm in extension. Then return to the starting position. Alternate arms, then repeat cycle.  Tip: Holding the hollow shape will be the limiting factor. If needed, start with an easier version (with feet on the ground) and progress from there before adding more band resistance.