Single-Arm Barbell Lateral Raise

The single-arm barbell lateral raise is a unilateral shoulder isolation exercise that raises one end of a barbell out to the side, working one arm at a time instead of two dumbbells simultaneously. It primarily targets the medial deltoid, the muscle responsible for shoulder width, while the asymmetrical load forces the core and obliques to resist lateral lean. Because a barbell has a longer moment arm than a dumbbell, it produces a heavier effective resistance even with a light plate. Training one side at a time also exposes and corrects strength imbalances between the left and right shoulders.

Muscles Targeted

• Primary: Medial deltoid (middle head of the shoulder)
• Secondary: Anterior deltoid, supraspinatus
• Tertiary: Obliques and core stabilizers, upper trapezius

Starting Position

Anchor one end of a barbell in a landmine attachment, or wedge it securely into a corner so it cannot slide. Load a light plate onto the free end. Stand side-on to the anchor, feet shoulder-width apart, and grip the bar just below the collar with the outside hand, arm hanging at your side with a slight bend in the elbow and shoulders level.

Execution Steps

1. Brace your core and stand tall with a neutral spine before initiating any movement
2. Lead with your elbow, raising the bar out and up in a wide arc away from your body
3. Raise to shoulder height, stopping when your upper arm is roughly parallel to the floor
4. Pause briefly at the top, feeling the contraction in the middle deltoid
5. Lower the bar under control, resisting gravity and the bar's pivoting weight back to your side
6. Complete the full set on one arm, then switch to the opposite side of the anchor and repeat

Form Cues

• Keep a slight, constant bend in your elbow - don't straighten or over-flex it as you raise
• Raise only to shoulder height; going higher shifts the load onto the traps
• Keep your torso upright and avoid leaning away from the bar to "cheat" the weight up
• Move slowly and deliberately - this is not a momentum-driven lift
• Keep your wrist neutral rather than letting the bar's weight roll it downward

Common Mistakes

• Loading too much weight, which forces body sway and turns the lift into a momentum swing instead of a controlled raise - use a light plate and add weight gradually
• Leaning away from the anchor point to help the bar up, which reduces deltoid isolation and stresses the lower back - keep your torso vertical throughout
• Shrugging the shoulder at the top of the movement, which shifts tension to the upper trapezius - stop the raise at shoulder height and keep the shoulder down
• Locking out the elbow, which increases stress on the elbow joint - maintain a soft bend throughout the set
• Rushing the eccentric, letting the bar's pivot drop it back down - lower for a full 2-3 count

Variations

• Single-arm dumbbell lateral raise: more common and easier to control since the load is symmetrical in the hand
• Landmine lateral raise (alternating arms): the standard setup for this movement, performed continuously side to side
• Cable lateral raise: keeps constant tension on the deltoid through the entire arc, including the bottom
• Seated single-arm lateral raise: removes the ability to use leg drive or hip sway to cheat the weight up

Tips for Progression

• Add small plate increments (2.5-5 pounds) once you can complete all reps on both sides with strict form
• Build up to 12-15 controlled reps per arm before adding load
• Slow the eccentric phase to 3-4 seconds to increase time under tension
• Add a 1-2 second pause at shoulder height to increase the difficulty without adding weight

Training Notes

Program the single-arm barbell lateral raise as an accessory movement 1-2 times per week, typically after pressing work, for 2-3 sets of 10-15 reps per arm with 45-60 seconds of rest between sets. Because it isolates the medial deltoid unilaterally, it pairs well as a finisher for shoulder day or as a corrective tool for lifters with a noticeable side-to-side strength gap.