I do them because Traps grow fast. And nothing builds the Yolk region like Shrugs. Think about all the Douches you see who have 16.5 inch arms but aren’t strong or fast or anything. Now think about all the guys you’ve seen with massive traps: They’re the big, powerful ones.
All the strong people are doing them, too.
A proper yolk will help you stay tight on the bench and keep good form on the Deadlift AND Squat.
A proper yolk will also help greatly in the farmers walk and car deadlift.
A proper yolk will also increase your olympic lifts and will increase your Military Press. (That’s right, the scapula move UP in the Military Press)
A proper yolk will help keep you injury free by ensuring shoulder joint health and neck protection.
And Shrugs are pretty fun. You get to bend the Bar and you see results pretty quickly. I can’t imagine why people who regularly lift weights don’t do shrugs.