SportsArt Plate Loaded Series combines quality & value in a simple, easy to use strength line designed to accommodate users of any fitness level or experience. A989 Hack Squat will work on your quads, glutes & calves, the engineered smoothness of the Hack Squat Machine spares your bones & joints. Three lockout positions are under the user's control throughout the exercises & provide user safety & the option of different start / stop positions.