The rock and roll up is an outstanding exercise for beginners as it works your entire body. The rock and roll up also requires coordination and engages your core.
Sit on the floor with your knees bent and a medicine ball in both hands. Place the medicine ball behind your head. Lie back onto the floor and then press the medicine ball overhead. Use your abs to sit up and then reach for the ball. Return to the starting position and repeat the movement.
The rock and roll up is a great way to work your entire body, especially your abs. You can do it along with some cardio for a complete workout.