Ironpower Powerball Underarm Trainer

The Ironpower Powerball is a fun to use underarm trainer. The rotation of the core is started with a string and accelerated by movements in the wrist, elbow and shoulder. The resistance increases with the speed of rotation, which provides an effective underarm workout. The Powerball is a great tool to improve strength, coordination and hand-eye coordination. Its compact size makes it perfect for using at home or on the go.