The barbell shrug is a very misunderstood movement, a commonly passed over exercise, and often an incorrectly executed one.
As a primitive or primal movement, the shrug is as commonplace as flexing your hand to coerce someone to hurry up. Second nature to us, this movement works some finer muscles of the back and the shoulder girdle. Specifically, the levator scapula, serratus anterior, rhomboids, and latissimus dorsi.
Read more: breakingmuscle.com