Primary muscles worked during this exercise are the upper abdominals. Secondarily are the lower abdominals.

Incline the bench unit one step. Raise the front leg of the bench unit so you get the bench unit in a V-shape. Position yourself on the bench with your legs bent. Keep your hands behind your head or in front of your chin. Curl your upper body towards your knees and then slowly lower your self to the starting position. Keep your lower body in contact with the bench unit during the complete exercise.