MedX put 90 million dollars into research to develop safe effective exercise equipment for the lower back. This equipment is often used for rehab. I first used this equipment in a doctor's office. Their Core exercise equipment was developed to strengthen the muscles of the abs and lower back. At Austin Fitness Trainers and New Orleans Personal Trainers we have all the MedX Core equipment plus full lines of MedX strength training equipment. The equipment and the protocol we use has contributed to our success working with those who have back problems.