User-defined motion. Natural motion. Functional training. It goes by many names but Precor user-defined equipment is different. Featuring a dual- independent stack system you get real dedicated resistance with true isolateral movements. The user-defined path allows multiple angles and independent movement while the dual stack means small incremental adjustments so it isperfect for deconditioned users fitness enthusiasts and athletes alike. In short you move the way you want to and the number of exercises that can be performed is limited only by the imagination.