Using a Barbell

In a comfortable position, hands slightly wider than shoulder width apart on the barbell

Slowly bring the barbell downward toward your lower neck or elbow below your shoulder

With a secure grip slowly press the bar above your head.

Depending on the Grip preferred Open/Close grip keep as much tension as possible through your ranges of motion 

To keep this tension you may not need to fully extend, only extend for as far as your range of tension

As you reach the max range of tension gradually come down slowly and repeat