"Professional athletes need to adopt various ways to exercise their strength, including arms, feet and waist strength and so on. And today this gyroscope shape auto light fitness wrist ball orange is also an effective tool to help you improve arms force. Made of high quality material, this product can strength grip skills, build muscle, tone arms and increase flexibility. What´s more, when you spin the LED lights inside, the ball will illuminate. Believe us, this product is really a good tool to strengthen hands and arms power, come to order it now! Gyroscopic Wrist Exercise Ball is an additively fun and powerful exercise tool that build the strength of your upper body through a few minutes of workout every day. This tennis ball sized Wrist Exercise Ball is a small engineering wonder: consists a freely revolving heavy gyroscopic rotor housed in a solid plastic shell, with a built-in self-powered LED lights. Once setting the rotor in motion by using a cord, you quickly build up its speed by moving the wrist in a circular motion. You may need some practices to get the act right, but once you get it work, you will feel like holding a hurrican in your ! The gyro rotor is capable of spinning at astonishing speed: over 12000 rounds per minute! The faster the rotor spins, the bigger inertia force you will need to resist, and the more exercises work on your fingers, wrist, arm, shoulder and chest. And when your hands get stronger, you will be able to make it spin faster! The ball weighs only 275 grams. However, at its maximum speed of about 12000 , it will excert about 140 newtons (nearly 40lb) of gyroscopic inertia force to your hand! That`s some serious exercise human body sustain. And you need to work very hard to achieve that kind of speed. Most people end up doing only upto 8000 !"
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