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NSD Roll'n Spin / Auto-Start Spinner Have fun strengthening hands, wrists and forearms in just a minute a day NSD Spinner will give your hands, wrists and forearms a workout with resistance training. It can develop and shape your grip and forearm muscles to improve baseball, tennis, golf games and most sports. Burn fat and get rid of flabby arms. It may help prevent and relieve repetitive stress induced injuries like carpel tunnel syndrome, tendonitis and RSI. NSD Spinner is a compact, simple way to isolation exercise without having to go to the gym. Lightweight, portable and perfect for traveling. It’s a great gift for anyone with no time to work out. Roll'n Spin No starter cord or external battery powered aid needed. We’ve made using the Spinner to strengthen your wrist and arms easier than EVER. The Roll ‘n Spin Spinner incorporates a pre-tensioner inside the gyroscope that allows for a simple roll back to spin up the gyro with enough momentum to get you started. Watch the attached video above to see how easy it is to get “started” exercising with the NSD Spinner. Easy to Use Our Spinners are a quick and effective way to increase your grip strength and an excellent complement to those who play sports. Professionals and amateurs alike can all benefit from our "One minute, One powerful hand" pledge! The instructions below apply to all the other NSD Spinner Roll'n Spin / Auto-Start models.