The Spin Wall inertial device is a patented system that sets the momentum instantaneously for invaluable eccentric work. Momentum can be adapted for different people and exercises. Its design allows you to be used without the Training Wall Panel System, so you can easily take away and fasten it in whatever place where you would like to train.The Spin Wall Compact has 6 levels of intensity, from the minimum to the very hard resistance only suitable for the most demanding athletes.