 Most health clubs have a main workout area, which primarily consists of free weights including dumbbells and barbells and the stands and benches used with these items and exercise machines, which use gears, cables and other mechanisms to guide the user's exercise.This area often includes mirrors so that exercisers can monitor and maintain correct posture during their workout.A gym that predominantly or exclusively consists of free weights (dumbbells and barbells), as opposed to exercise machines, is sometimes referred to as a , after the traditional color of weight plates.