Turbuster's Hack Squat is packed with features and exceptional movements, the Plate Loaded line merges superior technology with a passion for fitness. Plate loaded and free weight lines are the definition of strength training and equipment no club wants to be without.It works on your quads, glutes, and calves.The engineered smoothness of the Leg Press / Hack Squat Machine spares your bones and joints. Three lockout positions are under the user's control throughout the exercises and provide user safety and the option of different start / stop positions. Olympic style plates only. Weight plates optional.