The exercise ball crunch is a popular gym exercise targeting the abdominals. Unlike crunches on the floor or a bench, by using a ball, you can increase the range of motion and both stretch and contract the abs on every rep. The ball crunch can be performed for low reps with a slower tempo, focusing on a hard contraction, or for higher reps.
Targets the rectus abdominus or "six-pack" muscles
Stabilizing on the ball works the entire core
Increased range of motion compared to the floor or a bench
The better you get at it, the harder you can make every rep