The CoreStretch(R) by Medi-Dyne will help you stretch your way into lower back pain relief! The CoreStretch(R)was originally developed for Physical Therapists to help patients achieve the safest lower back stretch by using the body's natural traction. Now the CoreStretch(R)is available for your personal use at home! The CoreStretch(R)delivers the deepest, most effective lower back stretch as well as tight hamstrings and hips. Since it was originally developed for use by physical therapists, the CoreStretch(R)was designed with the understanding that all action initiates from the body's trunk (or core). The CoreStretch(R)provides a stretch that both allows the tissues to relax and elongate and develops the major muscle groups that make up the core.