You know it's fun to roll around but now it can also be good for you. The Roll With It works your core and your abs, targeting each of the four major abs groups: Rectus Abdominis, Transverse Abdominis, External Obliques, Internal Obliques (plus your lower back - Latissimus Dorsi muscle) for a complete posture and strength workout.
Extra Credit: 30 seconds rest between sets.