1.THE WORKING PRINCIPLE With a concentrated and measured movement of the powerball in the hand, the metal rotor can be spun up. : The higher the speed, the heavier the hand trainer becomes due to the forces generated 2. THE CORE MODEL The rotor of this model is made of metal and, with its higher weight, achieves a higher training effect from above and is particularly suitable for strength athletes and ambitious athletes 3. THE AUTOSTART Place your thumbs on the rotating body and pull the powerball up to the stop, or place the rotating body on a tabletop and pull up the powerball like a wind-up car,let go or lift the table top and then start with circular rotating movements 4.SMALL STRENGTH TRAINING Regular use of the Powerball is perfect training of the gripping device for athletes who rely on strength in their hands, but also for musicians and people who do a lot working with a keyboard 5.REGULAR TRAINING The training prevents complaints such as carpal tunnel syndrome, RSI (Repetitive Strain Injury Syndrome), tennis and golf elbow or tension in the arm, neck and shoulders 6.TRAINING EFFECT The positive effects of training with the Powerball are: Increase finger grip and coordination skills - trains shoulders, forearms and upper armsSMALL STRENGTH TRAINING The regular use of the Powerball is a perfect training of the gripping device for athletes who rely on strength in their hands, but also for musicians and people who work a lot with a keyboard