to selectively change the amount of resistance with the gravity included positioning of a resistance weight on a lever arm application_number US 201414552118 A description those of skill in the art will recognize that the following description is merely illustrative of the principles of the disclosure which may be applied in various ways to provide many different alternative embodiments this description is made for illustrating the general principles of the teachings of this disclosure and is not meant to limit the inventive concepts disclosed herein now referring to fig1 a perspective view of an exercise apparatus 2 is provided a frame 4 provides a rigid structure for the exercise apparatus 2 where various components and assemblies may be interconnected to the frame 4 in this embodiment a weight stack 6 comprises plates that are interconnected to the frame 4 via two guides the plates are selectively interconnected to the guides such that the plates may traverse vertically during utilization of the exercise apparatus 2 a pin is partially disposed between individual plates and the location of the pin determines which plates may traverse vertically during utilization of the exercise apparatus 2 plates located above the pin may traverse vertically while the plates located below the pin remain stationary the.