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The power cage is used with barbells, typically for squats, military press, pull-ups, knee raises for abs. Typically it has four upright posts with cross bars running between the four posts connecting the respective corners. These cages will have adjustable racks to place the barbell on, and also will probably have an adjustable bar on each side which can be used to limit range of motion, provide safety, and a place to set the bar down at different heights.