Do behind-the-back shrugs hit the middle traps more than regular shrugs?

Probably not by much. Holding the bar behind you sets the shoulder blades slightly back, but the work is still lifting the shoulders, which is mainly an upper trapezius job. In an EMG study of 30 healthy adults comparing ten trapezius and serratus exercises, a single-arm shrug drew the most upper trapezius activity, while middle trapezius activity peaked with prone exercises such as horizontal arm raises, so moves like the Lying Prone T Raise and rows are the better choice for the middle traps.

Is the behind-the-back shrug better than a regular barbell shrug?

Neither is clearly better for the traps. The front Barbell Shrug usually allows more weight, while the behind-the-back version keeps the bar off the front of the thighs and some lifters find it keeps their shoulders from rounding forward, so use whichever feels better or rotate between them.

Should I use lifting straps?

Straps are reasonable once your grip gives out before your traps do. They let you finish the set with the target muscle, though training some sets without them keeps your grip strength progressing.

How many reps should I do?

Most lifters do 3 to 4 sets of 8 to 15 reps with a weight they can lift through the full range and pause briefly at the top. Heavier sets of 5 to 8 work too, as long as the shrug stays full and controlled.

Why does the bar catch on my glutes or the backs of my legs?

Some contact is normal, because the bar travels up along the backs of the thighs. Take a grip just outside your hips, stand tall and let the bar slide lightly along your legs; if it still catches, the Smith Machine Shrug or the Trap Bar Shrug gives the load a clearer path.

Behind the Back Barbell Shrug

What Is the Behind the Back Barbell Shrug?

Behind the Back Barbell Shrug is an isolation exercise that primarily targets the back, specifically the upper trapezius, and also engages the rhomboids and the forearm muscles that hold the bar. It is a beginner-level movement: you stand tall with a barbell held behind your thighs and lift your shoulders straight up toward your ears, with no movement at the elbows, hips or knees.

The exercise is used to build size and strength in the upper traps, which run from the base of the skull and the neck out to the collarbones and the tops of the shoulder blades. It has no competition or testing role and usually sits near the end of a back, pull or shoulder session as accessory work. Holding the bar behind the body keeps it off the front of the thighs and lets the arms hang slightly behind the torso, which some lifters find stops their shoulders from rounding forward at the bottom of each rep.

Coaches often describe this version as a middle-trap exercise because the arms sit behind the body and the shoulder blades start a little pulled back. The work itself is still lifting the shoulders, which is mainly an upper trapezius job, so it is best treated as a shrug with a different bar position rather than a replacement for rowing. For the middle back, pair it with retraction work such as the Barbell Bent-Over Row, Cable Standing Face Pull or Lying Prone T Raise. Most lifters also handle less weight than on a front Barbell Shrug, because the bar has to travel along the backs of the legs.

It suits anyone who wants bigger or stronger traps and is comfortable with the shoulders slightly extended behind the body. If the setup feels awkward, start with the Dumbbell Shrug or the Barbell Shrug to learn a clean straight-up shrug, then move to the behind-the-back position. The Smith Machine Shrug offers the same idea on a guided track, and the Trap Bar Shrug puts the load at your sides with a neutral grip.

Muscles Worked

MuscleActivation

Upper Trapezius: Primary
Flexor Carpi Radialis: Medium
Flexor Carpi Ulnaris: Medium
Rhomboid Major: Medium
Brachioradialis: Low
Deltoid: Low
Erector Spinae: Low
Lower Trapezius: Low
Rectus Abdominis: Minimal

Instructions

Set a barbell in a power rack at about mid-thigh height and load it evenly.
Stand with your back to the bar, close enough that it touches the backs of your thighs, with your feet about hip-width apart.
Reach behind you and grip the bar overhand, palms facing back, with your hands just outside your hips.
Stand tall to lift the bar off the pins, then take a small step forward to clear the rack.
Set your start position: chest up, arms straight, knees soft, head neutral and eyes forward, with the bar resting lightly against the backs of your thighs.
Shrug your shoulders straight up toward your ears as high as you can, keeping your arms straight.
Pause for a second at the top.
Lower the bar slowly until your shoulders are fully down and your arms hang long.
Repeat for the planned reps, then step back and return the bar to the pins.

Common Mistakes

Rolling the shoulders
Circling the shoulders forward or back at the top adds no useful trap work and puts extra stress on the shoulders and neck, so move straight up and down.
Bending the elbows
Pulling with the arms turns the shrug into a partial row and takes load off the traps, so keep the arms long throughout.
Leaning or swinging
Tipping the torso forward or bouncing the bar with the hips and knees uses momentum instead of the traps and pushes the bar into the backs of the legs.
Cutting the range short
Loading more than you can control leads to small half shrugs that neither reach the top nor let the shoulders drop fully at the bottom.
Poking the chin forward
Pushing the head forward to chase extra height strains the neck instead of making the shrug bigger.
Lifting the bar from the floor
Picking a heavy bar up behind the legs from the floor rounds the lower back, so start from a rack set at about mid-thigh height.

Injuries

Behind the Back Barbell Shrug is a low risk exercise when performed with proper technique. The range of motion is short and nothing moves except the shoulder blades, so problems usually come from too much weight or poor setup rather than from the movement itself.

The neck takes the most strain when the chin pokes forward or the shoulders are rolled in circles at the top, so keep the head neutral and move the shoulders straight up and down. Because the arms sit behind the body, the shoulders are slightly extended throughout the set, and lifters with pain at the front of the shoulder may find this position uncomfortable. The lower back is at risk when a heavy bar is picked up from the floor behind the legs, so start from a rack set at about mid-thigh height. Heavy loads also tax the grip and forearms, and lowering the bar under control rather than letting it drop protects the shoulder joints from a sudden pull.

To make it easier, use the Dumbbell Shrug or the Smith Machine Shrug, which give a more comfortable or guided path. If the behind-the-back position bothers your shoulders, switch to the Barbell Shrug or the Trap Bar Shrug. To progress, add weight gradually or hold a longer pause at the top of each rep.

Stop the set if you feel sharp pain at the front or top of the shoulder, pain in the neck, a headache that builds during the set, or numbness or tingling running down the arm.

Overview

Primary Focus: Back
Equipment: Barbell
Modality: Strength
Difficulty: Beginner

Alternative Exercises

Frequently Asked Questions

Q: Do behind-the-back shrugs hit the middle traps more than regular shrugs?: Probably not by much. Holding the bar behind you sets the shoulder blades slightly back, but the work is still lifting the shoulders, which is mainly an upper trapezius job. In an EMG study of 30 healthy adults comparing ten trapezius and serratus exercises, a single-arm shrug drew the most upper trapezius activity, while middle trapezius activity peaked with prone exercises such as horizontal arm raises, so moves like the Lying Prone T Raise and rows are the better choice for the middle traps.
Q: Is the behind-the-back shrug better than a regular barbell shrug?: Neither is clearly better for the traps. The front Barbell Shrug usually allows more weight, while the behind-the-back version keeps the bar off the front of the thighs and some lifters find it keeps their shoulders from rounding forward, so use whichever feels better or rotate between them.
Q: Should I use lifting straps?: Straps are reasonable once your grip gives out before your traps do. They let you finish the set with the target muscle, though training some sets without them keeps your grip strength progressing.
Q: How many reps should I do?: Most lifters do 3 to 4 sets of 8 to 15 reps with a weight they can lift through the full range and pause briefly at the top. Heavier sets of 5 to 8 work too, as long as the shrug stays full and controlled.
Q: Why does the bar catch on my glutes or the backs of my legs?: Some contact is normal, because the bar travels up along the backs of the thighs. Take a grip just outside your hips, stand tall and let the bar slide lightly along your legs; if it still catches, the Smith Machine Shrug or the Trap Bar Shrug gives the load a clearer path.