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Studies cited by the Army Physical Fitness Research Institute showed that crunches and other abs workouts done on a stability ball provided superior results to the same exercises done on the floor. (See table below.)
Reason being abdominals training on an exercise ball demands better balance, increased flexibility and involves more overall muscle power.
You get the benefits of stability ball excercises because you're working out in several planes of movement instead of just one when on the floor.
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