A power rack is a traditional piece of powerlifting and bodybuilding training equipment. ... Power racks allow users to perform powerlifting and compound movements safely without a spotter as they come equipped with spotter arms that catch the weight if the user fails to move the weight. This is very useful if the user prefers to train alone. Power racks consist of four posts, two spotter arms and usually a pull-up bar. Power racks are most commonly used to perform compound barbell movements such as squats, bench press, deadlifts, and overhead press.