How to Do the Hammer Curl

How to do it

1. Stand holding a dumbbell in each hand with your arms fully extended at your sides, palms facing your torso (neutral grip), feet about hip-width apart and knees soft rather than locked.
2. Brace your core and pin your elbows close to your ribcage; they should stay in that position for the entire rep and not drift forward or flare outward.
3. Exhale and curl both dumbbells upward simultaneously, keeping your wrists straight and your thumbs pointing toward the ceiling throughout the movement.
4. Continue curling until your forearms are roughly vertical and the dumbbells are near shoulder height; avoid letting your wrists roll inward or your elbows swing in front of your body.
5. Hold the contracted position for a brief moment, consciously feeling the squeeze through the biceps and the thick brachialis just below it.
6. Lower the dumbbells back down in a slow, controlled arc over roughly two to three seconds, resisting gravity rather than letting the weight drop.
7. At the bottom of each rep, allow your elbows to fully extend so the muscle completes its full range of motion before initiating the next curl.
8. Reset your brace and grip before beginning the next rep, especially if fatigue starts pulling your wrists into flexion or your torso into a backward lean.

Form cues

• Thumbs stay up the whole way, no wrist rotation.
• Elbows glued to your sides, not traveling forward.
• Lower slower than you lift.
• Shoulders stay down, no shrugging the weight up.
• Full extension at the bottom, every rep.

Common mistakes

• Swinging the torso backward at the top of the curl: this is momentum stealing work from the brachialis and biceps; fix it by dropping the weight and keeping a rigid trunk throughout.
• Letting the elbows drift forward as fatigue sets in: when elbows travel in front of the body, the anterior deltoid takes over and the target muscles disengage; consciously anchor them against your lats.
• Rotating the wrist into a supinated position at the top: this turns the hammer curl into a standard curl and removes the unique stimulus to the brachialis; maintain a neutral thumb-up position from start to finish.
• Cutting the range short at the bottom: many people let the dumbbells rest at a slight bend rather than reaching full elbow extension, which chronically shortens the working range and limits long-term muscle development.
• Using a weight that causes grip failure before the biceps fatigue: the forearms and grip do work here, but if your grip gives out first every set, the load is likely too heavy for this movement at this stage; reducing weight lets the target muscles actually drive the rep.

Why do the Hammer Curl?

• Because the brachialis responds well to the neutral-grip loading angle, consistent hammer curl training tends to add thickness to the upper arm that supinated curls alone do not produce, particularly in the area between the biceps and the elbow.
• The movement also trains the brachioradialis, a prominent forearm muscle, which carries over to grip-intensive activities like pull-ups, rowing, and carrying odd loads.
• The neutral wrist position is generally more comfortable for people who experience wrist discomfort during pronated or fully supinated curl variations, making it a useful option for lifters working around minor wrist irritation.
• Because both arms move simultaneously in the standard version, it is time-efficient relative to alternating unilateral variations and easy to load progressively over months of training.

Hammer Curl variations

Alternating Hammer Curl

Curling one arm at a time allows more focus on each rep and is a useful regression for beginners who struggle to maintain stable elbows when both arms move together.

Cross-Body Hammer Curl

Instead of curling straight up, the dumbbell travels across the midline toward the opposite shoulder, shifting more emphasis to the brachialis and brachioradialis; often used by more experienced lifters chasing brachialis isolation.

Incline Hammer Curl

Performing the curl seated on an incline bench stretches the long head of the biceps at the bottom position, increasing the range of motion and the stretch-mediated growth stimulus, which makes it a solid progression for intermediate and advanced lifters.

Cable Rope Hammer Curl

Using a rope attachment on a low pulley keeps constant tension throughout the range of motion in a way a dumbbell cannot, making it a useful finisher or higher-rep burnout tool at the end of an arm session.

How to program it

Hammer curls most commonly appear in the 8 to 15 rep range in hypertrophy-focused programs, though some coaches program them as high as 20 reps when used as a finishing movement. In a typical upper-body or arm session they tend to land after compound pulling work like rows or pull-ups, since the brachialis and biceps are already warmed up but not yet fatigued to the point where isolation quality breaks down. Strength-focused lifters occasionally use them in the 6 to 8 rep range with heavier loads, prioritizing the brachialis development that carries over to pull strength. Sets of 2 to 4 are most common across all training styles.

Hammer Curl alternatives

Barbell Curl

Barbell · Isolation

Cable Curl

Cable · Isolation

Preacher Curl

Barbell · Isolation

Dumbbell Curl

Dumbbell · Isolation

Incline Dumbbell Curl

Dumbbell · Isolation

Concentration Curl

Dumbbell · Isolation