The Magic back support helps to relieve muscle tension and tightness in a matter of just minutes. *3 Level of Arch Adjustment Level 1 - Starting Position, Provides least amount of stretch for beginners. (Measures 2-3/4" from the floor) Level 2 - Provides greater stretch for advanced users (Measures 3-1/2" from the floor) Level 3 - Provides maximum stretch for advanced user (Measures 4-1/4" from the floor) *It's amulti-level design allows a person to work up to a great stretch when ready. It's compact and portable. Unlike larger stretching devices available, the Lumbar Extender can be used anytime and anywhere. It fits into just any small travel bag, brief case or golf bag. *Suitable for both men and women *Assemble in just a few seconds *3 position for optimum effect *Come with full instructions *It help postural imbalance