Exercise balls are one of today's top fitness tools - and for good reason! Using an exercise ball will improve the strength of the abs and the lower back. Since the exercise ball is unstable you have to constantly adjust your balance, which in turn will improve your balance, proprioception and flexibility. As an extra challenge you can use the exercise ball as a bench using free-weights to target those hard to reach stabilizer muscles. Widely used by fitness trainers and athletes, the Theragear Swiss Ball Pro is designed especially for use with added resistance like dumbbells. Theragear Swiss Pro Ball will deflate slowly if punctured and is the choice of many professionals for all commercial use.