This fitness equipment is Smith frame. Smith frame is a very useful fitness equipment. Its barbell has a limited sliding track, so the trainer can use heavy objects with confidence and boldness, and it is not limited to squat training, but also can do bench press (upward tilt, flat plate, downward tilt). Bow rowing, biceps bending. Lift heel, and so on, is an out-and-out "all-body device".

As shown in the figure, the barbell pieces on both sides should be adjusted, leaving only one barbell bar. I don't believe you have a chance to go to the gym and ask what a Smith rack is.