Ab Mats are another in a long line of devices that are designed to help you train your core and mid-section.
You’ve got your ab benches, ab roller wheels, ab loungers, and yup… ab mats.
Ab mats are low tech and awesome because they take the regular crunch and significantly increase the range of motion required to compete the sit-up. A longer range recruits more muscle, and by extension, helps your core get stronger (and your abs 12% more six-packy).
Mainly, ab mats fully extend your range of motion, forcing you to be honest about how far back you are actually going with your crunches.