Single-Arm Dumbbell Shrug

What is the Single-Arm Dumbbell Shrug?

The single-arm dumbbell shrug is a traps isolation performed one side at a time with a single dumbbell, elevating one shoulder toward the ear while the other stays still. Working one side alone lets you focus on and even out a lagging trap, and holding on to a rack or bench with the free hand steadies the torso so only the working trap does the job.

Muscles worked

Primary: Traps

The upper trapezius of the working side is the target, elevating that shoulder blade straight up toward the ear against the dumbbell and lowering it under control.

Secondary: Forearms

The forearm of the working side grips the dumbbell to hold the load through the set, since the arm hangs straight.

How to perform the Single-Arm Dumbbell Shrug

1. Stand tall holding one dumbbell at the side with the arm straight, and hold a rack or bench with the other hand for balance.
2. Working one side isolates that trap and lets you brace the trunk against the offset load.
3. Let the dumbbell hang so the working-side trap is fully stretched at the bottom.
4. Elevate that shoulder straight up toward the ear, keeping the arm straight and the torso from leaning.
5. Squeeze the trap at the top, then lower under control to a full stretch before the next rep.
6. Keep the neck neutral and the hips square rather than hiking the whole side to cheat the load up.

Suggested working range: 12–20 reps. Default progression: double progression.

Mechanics

A unilateral single-joint isolation: one shoulder blade elevates and depresses while the arm hangs straight and the elbow stays locked, so the working trap does all the work. As a one-sided isolation, holding a fixed support with the other hand steadies the torso and lets you focus fully on one trap through its short range, exposing any side-to-side difference an even bar hides.

Form cues

• •Hold a dumbbell in one hand, brace the other on a rack or bench, and stand tall.
• •Shrug the working shoulder straight up toward the ear and pause to squeeze at the top.
• •Lower under control to a full stretch, letting that shoulder drop before the next rep.
• •Keep the torso still and level. Don’t lean or hike the hip to help the shrug.

Common mistakes

• •Hiking the whole side of the body to heave the dumbbell up rather than shrugging the shoulder.
• •Leaning the torso away from the load instead of keeping it upright and square.
• •Rolling the working shoulder in a circle rather than elevating it straight up.
• •Jutting the head toward the working side and straining the neck.

Variations & alternatives

• •Dumbbell shrug: the two-handed version that loads both traps together.
• •Single-arm cable shrug: one side at a time with constant cable tension for a strong top squeeze.
• •Incline dumbbell shrug: a prone angle that biases the mid- and lower traps.
• •Barbell shrug: a bilateral bar shrug for loading the most total weight.

Face Pull

Traps · Cable

Barbell Shrug

Traps · Barbell

Dumbbell Shrug

Traps · Dumbbell

Cable Shrug

Traps · Cable

Smith Machine Shrug

Traps · Machine

Programming: sets, reps & when to use it

Program single-arm dumbbell shrugs as a traps accessory in the library’s 12–20 rep range, where a full elevation and a controlled squeeze build the upper traps better than heavy weight. They’re ideal for bringing up a weaker or lagging trap, since neither side can carry the other. Run the weaker side first and match it. A few sets per side after your main work suffice.

Frequently asked questions