Lock feet in, with pad comfortably on hips. Cross arms over chest. If using weight, hold weight plate at chest level. Pressing hips into the pad, relax the spine. Squeeze together (retract) shoulder blades. In a controlled motion, lift head and shoulders up until spine is comfortably hyperextended. Avoid hyperextending the neck. Maintaining controlled motion, return to starting position. Do not allow muscles to relax before next repetition.
Good back exercises using only your body weight.