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.
Shoulder presses are the best way to isolate the big muscle over your shoulder, called the deltoid. According to a 2013 study in the Journal of Sports Medicine, the shoulder press is better at activating the deltoid than the bench press, one of the most well-known upper body exercises.