Let’s face it: crunches and sit ups can be real motivation killers. Plus, half the time they don’t even successfully tone the muscles in your abdomen. Now there is a better way to flatten that tummy and build rip roaring abs that you will want to show off. The Ab Flex Belt is a simple and effective tool to sue to tone, firm and strengthen abdominal muscles without stressing your neck and back with a lot of stomach crunches.