Shoulders are primarily known to be worked with pressing motions, in this exercise we are doing just the opposite. Varying your moments while training ensures that you hit all parts of the muscle, isolate effectively, and increase range of motion and stability.
Start by standing with your feet about hips distance apart with a micro-bend in your knees, holding weights with your arms straight down by your sides. Without using momentum or leaning back, pull the weights until you feel the hardest muscle contraction in your shoulders and traps. Be careful to not strain or hyper extend your neck or shoulders.