1) It is a very interesting toys to make your forearm sore and gets the blood going. For Medial Epicondylitis, Prevent Tendonitis and Improve Grip Strength, Relieve Pain From Tennis Elbow, Golfers Elbow, and Tendinitis, Medium, Intermediate * 2) Powerball Wrist Ball Toys Hand Grip Strengthener ;Hand Grip Exerciser;Relieve Stress ---Anti Stress Anti anxiety for EDC, ADHD, Children, Teens, Student and Adults * 3) Highly recommend to anyone,So, on your 5 minute break take it out and give it a go. You will be impressed on what this device can do for you. It works on your grip, forearm, and blood flow you will be amazed. * 4. The Forceball can generate between 1 and 30 pounds of resistance by spinning at almost 10,000 rpms. * 5. The more exciting part, this exercise ball lights up when it's spinning! And the LED light is not powered by batteries but your spinnin. It's battery free.No need to worry about power running out!! 【 How to Start it】 * 1) Pull off the plastic insulation before use * 2) Insert the red string( Included) into the hole, wind it up, and pull straight down, fast enough to have the gyroscope turn the LED on. * 3) Turn your hand facing down, and slowly start to rotate,you will feel that it is scratching against the inside of the wrist ball. * 4) Keep rotating your wrist and the gyroscope will spin faster, develop a higher pitch sound. Once you feel it spinning fast enough, stop your hand , you could feel it oscillating right in your palm. Please note record will be deleted. 【Package】 1x Forceball with LED 1x Starting Cord 1x User Manual
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