The POWER Rack works by incorporating pneumatic strength columns, which can be attached to the bar, allowing Keiser's patented air technology to be used solely, or in combination with, free weights. This allows for a wide spectrum of training, enhancing power and stability for the athlete. Athletes who have trained on the POWER Rack have seen overall strength gains, better speed, control and explosive power. The POWER Rack is a favorite unit for professional sports teams. Our POWER Rack without Air is also available in these same specs.