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LED Gyro Power Powerball Autostart Range Gyro-powered Wrist Ball Gyroscoop Hand Arm Muscle Strength Trainer Fitness Equipment. Powerball drills are completely isometric, so it can complement any training method. Powerball works the arms in a way that traditional isotonic (free weight) training cannot, and absorbs a higher percentage of muscle fibers in less time. If you want to improve your wrist, grip and arm strength, the wrist training ball is perfect for you!