While the internal gyroscope works the same as in a standard Gyro-Ball, this extended version allows for a firmer grip. This can be more comfortable and allow for a faster warm up or accelerated burn for a workout. It can technically be used with two hands, but I personally find it works great one handed.
This thing is super fun to use, it's basically a fidget spinner on steroids. You can sit at your computer watching Youtube, and train your grip. Or even just spin it at a low intensity that doesn't cause fatigue and do it for fun.
It works by having you fight against the internal gyroscope to keep the ball steady. The unique motion and resistance requires you to recruit all the different muscles in your forearm, wrist, hand and fingers. This gets the blood flowing very quickly which makes it a great warmup tool for gaming and aiming in particular.
Beyond gentle use for warming up, the faster you spin it, the faster the internal gyroscope rotates, making it harder to hold. By spinning it faster you can greatly increase the intensity of the exercise to train your grip strength.
