The exercise ball V-up is a popular movement to target the abdominal muscles, particularly the rectus abdominis or "six-pack" muscles. It involves passing an exercise ball or yoga ball back and forth between the hands and feet while performing V-ups. It can be performed for reps or time as part of any ab-focused workout or bodyweight circuit.
Abs contract during both halves of the movement
Great for building muscular endurance in the core muscles
Simple way to make traditional V-ups more difficult