The Dyna-Flex powers up with the rising pitch of an F-18 fighter - with no batteries, no motor. Yet we dare you to hold on to it! Give it a quick pull or thumb flick to get it moving.
Rotate your hand. It starts to race and hum. Soon it's whirling at over 9,000 revolutions per minute!
Meanwhile, your wrists, grip, and arm are straining and working out against a powerhouse gyroscopic action.
In fact, Dyna-Flex is now spinning internally so fast that it wants to leap out of your hand!
Need a break? Slow down the rotations, or pass it on to an unsuspecting friend. Watch them try to hold onto it! As an executive relaxer, a carpal-tunnel / arthritis reliever, or a strength and coordination builder, Dyna-Flex will knock your socks off!

• Build strength while improving coordination. New easy grip outer sphere for better control and prolonged usage.
• Generates up to 32lbs of gyroscopic pressure when maximum RPM's (13,000) are reached.
• Variable resistance is achieved by increasing or decreasing the speed.
• Because Dyna-Flex is iso-tonic and iso-kinetic, rather than iso-metric, it is safe and effective, in the medical therapeutic setting, as well as for training and rehabilitation.
• Exclusive new design for ease of starting. Perfect for warm-ups!