Power cage

A power cage (also known as a power rack, squat cage or squat rack) is an item of weight training equipment designed to allow for a free-weight workout using a barbell without the movement restrictions imposed by equipment such as the Smith machine. It essentially comprises four vertical posts with two movable horizontal bar catchers on each side. Many power cages also feature bars built into the cage or on the exterior for performing exercises such as pull-ups and chin-ups.