Step by Step Guide
Begin standing with the feet hip distance apart and hold a dumbbell in each hand at the shoulders with a pronated grip (palms facing forward).
Press one arm directly overhead as you straighten that elbow. Keep the abs engaged to maintain a neutral spine.
Lower that arm down.
Repeat the shoulder press on the other arm.
Continuing alternating left and right arm.
Repeat for the desired repetitions.
One common mistake is losing abdominal control which is exhibited by the lower back extended (arching). This is a way of compensating. To avoid this, engage the abs by pulling the belly button to your spine. This will maintain a neutral spine position so the focus can be on strengthening just the shoulders.