In the beginning and even as an advanced athlete you need to manage the energy that flows from you feet, through your hips to your shoulder. One of the best ways to accomplish this energy is to choose the right load.
What is the right load for a dumbbell shoulder press?
It it the load you can press for 8 to 12 repetition from a seated position. When you are seated, you cannot use your body to create momentum and lift a load that is beyond the ability of your arms and shoulders.