When performing the exercise on a flat surface 90 degrees it recruits most of the muscle fibers in your pectoralis major.
Dumbbell press. The flat dumbbell chest press is the king of exercises for developing your pec muscles overall. The dumbbell military press is one type of shoulder press you can use to strengthen your upper body. Most of these fibers are located in the medial. Generally lifters will have an easier time setting up and controlling two relatively lighter weights.
Alternating dumbbell bench press if youre using dumbbells rather than a barbell with the aim of evening out any strength imbalances in your body the alternating version of the exercise is one. Because you have to balance the dumbbells individually it also contributes to strong core development. You can do dumbbell presses on a standard flat. The dumbbell bench press is like the younger brother of the barbell bench press.