The machine bench press is a machine-based exercise targeting the chest and upper body. It approximates the motion of a bench press, but uses a selectorized weight-stack or plate-loaded machine. Many such machines also allow you to choose between different grips and grip widths. Machine-based presses are often done for moderate to high reps, such as 8-12 reps per set or more, as part of the upper-body or chest-focused portion of a workout.
Builds size and strength in the pecs, triceps, and deltoids
Work the muscles without worrying about stabilizing the weight