JAGDIV Magic Back Braces Stretching Device for Bed, Chair & Car, Multi Lumbar Support Ab Exerciser  (Black)

How to use : Step 1: For easy arch adjustment, Lay the base and support arch on a secured mat, rug, or carpet with the wide ends closet to you. Step 2: Secure the wide end of the base against your knees. Slide the wide end of the support arch into the single slot on the wide end of the base Step 3: Press down with your thumbs and gently slide the narrow end of the support arch into level 1 or into another position on the base as per your requirement. Multi-level design : Level one: Starting Position Provides the least amount of stretch for beginners. Level Two : Provides greater stretch for advanced users Level Three: Provides maximum stretch for advanced users.