How do you do shoulder shrugs with a dumbell?

Typically, you would do shoulder shrugs with 2 dumbells, one held in each hand. If you want to do unilateral shoulder shrugs, then hold the dumbell in one of your hands, and let your arm hang straight down toward the ground. Then, you simple raise your shoulder joint straight up toward the ceiling, while keeping your arm straight holding the weight in your hand. You hold this position for 3-5 seconds, then bring your shoulder back to where you started.

After you are done with your repetitions, then you can switch the weight to your other hand, and repeat. If you have 2 dumbells, then you can hold one of them in each hand, and do the same movement on both sides simultaneously.