Stand with a dumbbell in each hand hanging at arms’ length at your sides. Keeping the arms close to straight, raise the dumbbells out to the sides and up past shoulder height. The more internally rotated the arm, the more the emphasis on the lateral delt; the more externally rotated, the more the anterior delt will contribute.
 
Lateral raises can be taken all the way overhead as well—allow the arms to naturally externally rotate somewhat the higher they get rather than trying to force internal rotation.
 
Purpose
The dumbbell lateral raise focuses on the lateral and anterior delts with some work for the upper back and neck. Overhead raises can help improve and maintain shoulder mobility.
 
Programming
Generally sets of 8-15 reps are appropriate.