Muscle: Trapezius
Step 1: Stand upright and hold two fairly Heavy dumbbells at your sides, with your palms facing each other (neutral-grip).
Step 2: Keep your shoulders relaxed Shrug your shoulders as if you were trying to touch them to your ears.
Step 3: Hold the top most position, then gradually lower them to the starting position. Do not bend your elbows or shift your head forward during the motion. Repeat.