Core work is crucial for your summer body and optimal health. DynaPro Direct exercise balls offer a variety of ways to do core work including planks, stir the pot and of course – the classic crunch. Add our black exercise ball to the mix and make this your summer of fitness. This effective exercise ball will not only strengthen your core, but will also tone muscles throughout the entire body. This professional quality exercise ball is anti-burst tested at 2000 lbs, designed with high quality PVC material and comes with 100% money back guarantee. Grab this versatile exercise ball today, and perform your favorite core and abdominal exercises.