The standing overhead press is a great exercise to strengthen your shoulders, arms and core. Here are the steps to perform it with a dumbbell:
Stand with your feet shoulder-width apart and hold a dumbbell in each hand at shoulder level. Your palms should face forward and your elbows should be slightly in front of your body.
Brace your core and squeeze your glutes to stabilize your body. Press the dumbbells up over your head until your arms are fully extended. Keep your head and neck neutral and avoid arching your back.
Lower the dumbbells back to the starting position with control. Repeat for the desired number of reps or time.