Lie upper back perpendicular on bench. Flex hips slightly, so hips are slightly lower than torso. Grasp revolving barbell cable attachment from behind. Pull to position cable attachment over chest. Fix elbows with small bend.
Lower cable attachment toward pulley with elbows bent only slightly. Lower until shoulders are fully flexed or upper arms are in-line with upper torso. Raise cable attachment over head and continue toward lower body until cable becomes very close to head. Repeat.
Lower body extending off of bench acts as counter balance to resistance and keeps upper back fixed on bench. Avoid hips from raising up significantly. Actual range of motion is dependent upon individual shoulder flexibility. Keep elbows fixed at small bend throughout exercise.