To do work out with heavy weight you can use barbell, trapezius upper layer fiber is used in this.
First of all we will hold over head grip, then hold the bar and stand straight. Now without bending the elbow, take shoulder upwards and bring it down slowly. Upwards – exhale, downwards- inhale.
This workout is even better than barbell shrugs if you do it with the right position and posture. Upwards – exhale, downwards- inhale.