Power Racks, Power Cages & Squat RacksA power cage (a.k.a. power rack, squat cage, or squat rack) is an item of weight lifting equipment designed to allow for a safe free weight workout using a barbell without the movement restrictions imposed by equipment such as the Smith machine. The power cage was patented in 1987 by Karl I. Mullen of Portland, Oregon.
Its basically vertical posts with movable horizontal bar safety catchers on each side. The uprights are normally held together top and bottom thus making a cage. A safe free weight workout can be perfomed since dropping the weight will result in it being caught by the side bars.
A power cage can be used for many of exercises including squat and various over-head presses. Bench presses, partial squats and partial deadlifts for instances are practiced in this cage. Partial movement allows for greater weight to be used in a safe way, allowing for an overloading of muscle groups to produce greater growth.