DYNAFLEX Fitnesstrainer

The DYNAFLEX is an individual music-fitness trainer in the palm of a hand.
The hand, in which the whipping top is held, builds hand-, wrist-, and forearm muscles; shape, speed and dexterity are increased.
A great training device for maintaining the muscels in shape.
In connection with the VARIGRIP Fingertrainer it becomes a complete workout program for your fingers, hands and arms (instructions see pdf).