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.
When performing the shoulder press, the deltoids are the prime movers. Three individual muscles make up the deltoids divided by location: anterior -- or front; middle; and lateral -- or back. When you fully extend your arms, you mainly activate your anterior deltoid but still use the whole muscle.he triceps muscle is found on the rear of your upper arm; its main function is to straighten your arm. Your triceps are secondary muscles, which cause your arm to extend during the shoulder press. You use them more heavily in the downward phase to help you slowly lower the weight safely rather than dropping it.