STARTING POSITION:
Lie on your right side on a fitball and place your left foot in front of the right foot. Straighten your legs and put your hands on the shoulders crossing your arms. Squeeze your abdominal and oblique muscles. Your belly should slightly face the roof.
MOVEMENT:
Using your oblique muscles, raise your torso up while you exhale. Return to the starting position while you inhale. Repeat the movement for the specified amount of repetitions, then switch sides and repeat the exercise.
TIPS: Keep the neck and the head in the same position at all times.