The innovative exercise machine will allow you to exercise and workout anywhere! don't let the small size fool you. Pick one up, spin it up to 10,000+ RPM and you'll be amazed by the amount of physical work required to keep it spinning at speed, using such a small compact motion. Go ahead, feel the burning forearm after a minute of use. Because the resistance is provided by angular momentum built up through a spinning mass, a few minutes a day on our Spinner can be equivalent to hours of full motion work with a dumbbell or a Curl. For athletes, amateur and professional alike, strong grip and forearm provide the ultimate in power, speed and control in just about everything you do. Be it golf, tennis, Baseball or just about any sport that involves the use of hands and arms, using the nsd Spinner will allow you to hit it harder, hit it faster and hit it straighter. Besides the physical benefits, it is just downright fun to play with. Challenge a friend. Challenge a co-worker. Or a family member. See who can make the Spinner spin faster or glow brighter. See who can keep their Spinner spinning longer. Or break it out during break time at work as your co-workers Gather to watch in awe. You can have fun while exercising, or exercise while you have fun. Tips on operating your nsd Spinner no battery required; just like riding a bike! your hand is the battery of this device. The motion of your hand rotating the Spinner is similar to making ice cubes swirl inside a glass. The essence of operating the Spinner is not about how fast you rotate your wrist. It's about how to synchronize your wrist rotation to the momentum and timing the Rhythm of the rotor's gyration. The faster the rotor spins, the easier it is to operate. Make sure you start the Spinner with sufficient speed.