7 of 8 people found the following review helpful
total core is vey easy to use
It really helps to keep you back and neck straight and stop the aching that you would normally get from doing sit up so you can do alot more.
Ive only had the product 2 days and can already feel it working on my stomach. It comes with a dvd and small gym ball and the dvd gives you great tips on different ways to do the sit ups.