This Back Stretcher device supports: *Spine traction * muscle relaxation *Back massage and support *waist pain * Posture correction * Intervertebral disc herniation *muscle spasm * pinch nerve * Lower back and upper back pain relief *Chiropractic 3 different level settings. Level 1 is low Provide the minimum amount of stretch for beginners. Level 2 medium strength Provide a greater extension for advanced users. Level 3 strength Provide the largest extension for advanced users. You can adjust the level to your size and treatment needs. Use the device 1-2 times a day for 5 minutes each time to stretch the back muscles and restore the natural curvature of the spine.