[Blueface]

I own one.
I love it.
With two herniations (L4-L5 and L5-S1), it is the main reason I can still walk.
I have evolved to where I now use it to do inverted crunches for my goal of a six pack by 55 (April).
Highly recommended if you have back problems and they told you surgery was a must, and gave you permanent handicap parking privileges, as they did for me 7 months ago. To date, f...them with that surgery idea.