Olympic Barbell Hammer Curl
- Target muscle
- Brachioradialis
- Synergist muscles
- Biceps Brachii, Brachialis
- Equipment
- Olympic barbell
- Body part
- Forearms
- Type
- Strength
The Olympic barbell hammer curl is a strength exercise that trains the brachioradialis as the primary mover, with the biceps brachii and brachialis assisting. One end of the barbell is anchored on the floor and you curl the free end with both hands stacked in a neutral, palms-facing grip, which keeps the load on the forearms and elbow flexors. It works well as an accessory for arm thickness and grip strength.
How to do the Olympic Barbell Hammer Curl
- 1Wedge one end of an Olympic barbell into a corner of the room or a landmine sleeve so it cannot slide, and load plates on the free end.
- 2Stand facing the anchored end with your feet shoulder-width apart, and grip the free end of the bar with both hands stacked one above the other, palms facing each other in a hammer grip.
- 3Step back until your arms hang straight down with the bar end just in front of your thighs, then brace your core, keep your chest tall and pull your shoulders back and down.
- 4Pin your upper arms against the sides of your torso so your elbows stay close to your body.
- 5Exhale and curl the end of the bar upward in a smooth arc, keeping your wrists straight and neutral and your elbows fixed in place.
- 6Continue until your elbows are fully flexed and the end of the bar is near chest height, and squeeze at the top without letting your elbows drift forward.
- 7Inhale and lower the bar under control back to the starting position, resisting the weight on the way down.
- 8Complete all reps, then lower the free end to the floor and strip the plates before unracking the bar.
Form tips
- Keep your wrists locked in a neutral position throughout — any flexion or extension shifts stress away from the target muscles and onto the wrist joint.
- Control the eccentric: aim for a 2–3 second descent on every rep to maximize brachioradialis tension and reduce momentum.
- Choose a load that lets your upper arms stay stationary; the moment your elbows swing forward, the weight is too heavy.
- Wrap your thumbs fully around the bar and check that the anchored end is braced before every set — a bar that slips out of the corner drops the loaded end on your feet.
- Pause for one count at the top to eliminate momentum and ensure the muscles are doing the work, not the stretch reflex.
Common mistakes
- Swinging the torso or using body English to heave the bar up, which removes tension from the brachioradialis and brachialis and increases lower-back strain.
- Letting the elbows flare out or drift forward at the top, which recruits the anterior deltoids and reduces forearm and biceps activation.
- Setting up with the anchored end loose so it lifts or slides mid-set, which makes the bar path unpredictable and risks dropping the loaded end.
- Dropping the bar too quickly on the descent, which eliminates eccentric loading — one of the main reasons to use a barbell for this movement.
- Letting the hands twist out of the stacked hammer position so the wrists bend sideways, which places uneven stress on the wrist and elbow joints and pulls tension off the brachioradialis.
Frequently asked questions
What muscles does the Olympic barbell hammer curl work?
The primary mover is the brachioradialis, the large forearm muscle that runs along the outside of the forearm. The biceps brachii and brachialis act as synergists, assisting with elbow flexion throughout the movement.
What makes a hammer curl different from a regular barbell curl?
A regular barbell curl grips the shaft with a supinated (palms-up) hold, which targets the biceps brachii. The hammer curl grips one end of the bar with both palms facing each other, and that neutral position shifts the primary emphasis to the brachioradialis and brachialis while the biceps assist.
Is the Olympic barbell hammer curl good for beginners?
It can work for beginners who are already comfortable setting up a barbell, but a full-length Olympic bar is unwieldy and both hands share a single end, so the load is harder to fine-tune. Most beginners learn the pattern faster with dumbbell hammer curls before moving to the barbell version.
How many sets and reps should I do?
For strength and muscle development, 3–4 sets of 8–12 reps at a moderate, controlled tempo is a solid starting point. Prioritize form and a full range of motion over loading more weight.
What are good alternatives to the Olympic barbell hammer curl?
Dumbbell hammer curls offer the same neutral-grip stimulus with independent arm movement and a more natural wrist position. Cable rope hammer curls add continuous tension throughout the range of motion. Both are effective substitutes when an Olympic barbell is unavailable or uncomfortable.
