Cervical and lumbar traction units are an excellent therapy in relieving back and neck pain by causing a gentle stretch to the muscles and joints. Over the door traction units are very portable and can be used almost anywhere. Inversion tables use gravity to provide effective traction to the spine to relieve back pain. Motorized traction such as the Saunders Hometrac can produce up to 200 lbs of traction to the lower back.