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.
As its name implies, the shoulder press targets the shoulders, specifically the deltoids. However, this classic exercise doesn't limit itself to one muscle group; it engages numerous secondary muscles as synergists and stabilizers.he rising motion of the shoulder press also contracts the middle and lower trapezius, using the upper traps to help stabilize the motion. Shoulder presses also work the rotator cuff and the small supraspinatus muscle of the shoulder blade as secondary muscles.