1) Hyperextensions.

The purpose of this exercise is to work the spinal erectors.
The subject climbs onto the specially designed lower back extension bench face down. With legs hooked into the supports of the bend he/she lowers her upper body in an arc-like motion (arms clasped behind the neck) until it’s in an about 90 degree angle to the legs. Then slowly bends it back up to starting position.
Extra considerations: be careful not to overextend the lower back at the top of the motion.