AbMat FirmTake your ab workouts to the next level! The AbMat Firm is 35% more dense than the original AbMat, which provides an enhanced workout by isolating your upper and lower abs as well as your obliques and lower back muscles. With the AbMat Firm positioned beneath your spine at the start of a sit up, you get a full stretch of your abdominal muscles, which is impossible to obtain on a flat surface. As you rise, your pelvis is supported, allowing your