Provides stability and promotes proper torso placement when performing abdominal exercises. Made to help you enhance your core strength, the ab mat flexes the spine to lengthen the abdominal muscles for more effective sit-ups using compound movements. The Grind Ab Mat is designed to provide the full range of motion necessary to train the entire abdominal muscle groups. Reduces discomfort during crunches and sit-ups and helps the body achieve full range of motion. It is also good for strengthening your back and oblique muscles too.