There is also a special null type, the type of the expression null, which has no name. Because the null type has no name, it is impossible to declare a variable of the null type or to cast to the null type. The null reference is the only possible value of an expression of null type.
The military barbell press mainly works the shoulder, or deltoid, muscles. The anterior deltoid, the front head of the shoulder muscle, does much of the work. The side, or lateral, deltoid and the rear, or posterior, deltoid are also involved in the movement, although to a lesser degree than the anterior deltoid.
Supporting Muscle Groups. Due to the compound movement of the barbell military press, many of your muscles work together to keep your joints stable and safe from injury. Your pectoralis major, serratus anterior, and biceps all help keep your upper body straight and rigid while the motion is completed.