Does the hammer grip work the brachioradialis more than a regular curl?

Not necessarily. The neutral grip gives the brachioradialis good leverage and takes some of the work off the biceps, but a study of competitive bodybuilders curling on a cable found a neutral rope grip produced lower biceps activity and slightly lower brachioradialis activity than a palms-up bar grip. Think of the hammer curl as a way to shift work away from the biceps rather than a brachioradialis isolation drill.

How do I make a band hammer curl harder without buying a new band?

Widen your stance or step on the band closer to your hands so it starts under more tension, and slow down the lowering phase. Once you can do more than about 20 controlled reps, a heavier band is the better next step.

How many reps should I do?

Most people do 2 to 4 sets of 10 to 20 reps, stopping a rep or two before form breaks down. Bands suit higher reps well, and a slow lowering phase keeps the set challenging.

Is a band hammer curl as good as a dumbbell hammer curl?

It works the same muscles, but the load feels different: a band is lightest at the bottom and hardest near the top, while a dumbbell stays the same weight through the rep. A band is a good choice at home or on the road, and the Dumbbell Hammer Curl makes it easier to add load in small, measurable steps.

Can I do it one arm at a time?

Yes. Stand on the band with one foot and curl with the hand on the same side, which helps if one arm is weaker or the band is too heavy for both arms at once.

Band Hammer Curl

What Is the Band Hammer Curl?

Band Hammer Curl is an isolation exercise that primarily targets the biceps and also engages the forearms, working the brachialis hardest while the biceps brachii and the brachioradialis in the forearm share the lift. It is a beginner-level movement: you stand on the middle of a resistance band, hold one end in each hand with your palms facing each other, and curl both hands toward your chest at the same time.

The neutral, thumbs-up grip is what separates it from the regular Band Curl. With the palms facing in, the biceps loses some of its leverage and more of the work shifts to the brachialis, which sits under the biceps, and the brachioradialis along the top of the forearm. Building those two muscles adds thickness to the arm when viewed from the front and side, and both muscles help in pulling and carrying.

A band loads the curl differently from a dumbbell. Tension is lightest at the bottom, where the band is shortest, and climbs as the band stretches, so the top half of the rep is the hardest part. That makes the exercise forgiving on the elbows at the start of the rep and demanding near the top, and it is a good reason to lower each rep slowly rather than letting the band snap your hands back down. For a constant load through the whole range, the Dumbbell Hammer Curl and Cable Rope Hammer Curl are the closest gym versions.

Because a band is light, portable and adjustable just by changing your stance or the band, this curl suits home training, travel, warm-ups and high-rep accessory work at the end of an upper-body or pull session. Beginners can start with a light band and a narrow stance, and anyone who wants more forearm emphasis can pair it with the Band Curl (Reverse Grip).

Muscles Worked

MuscleActivation

Brachialis: Primary
Biceps Brachii: High
Brachioradialis: High
Extensor Carpi Radialis: Medium
Deltoid: Low
Flexor Carpi Radialis: Low
Erector Spinae: Minimal
Flexor Carpi Ulnaris: Minimal
Rectus Abdominis: Minimal

Instructions

Stand on the middle of a resistance band with your feet about hip-width apart, the band under the middle of both feet.
Hold one end of the band in each hand with your arms straight at your sides and your palms facing your thighs.
Stand tall with your chest up, shoulders down and knees soft, and take any slack out of the band.
Keeping your upper arms against your sides, bend your elbows and curl both hands up toward your chest.
Keep your thumbs pointing up and your wrists straight as the band stretches.
Stop when your hands are at about lower chest height and your forearms are just past horizontal, and pause briefly.
Lower your hands slowly against the band until your arms are straight again.
Repeat for the planned reps without leaning back or letting your elbows drift forward.

Common Mistakes

Swinging the torso
Leaning back or rocking the hips to get the hands up moves the work away from the arms and usually means the band is too heavy.
Elbows drifting forward
Letting the elbows travel forward turns the top of the rep into a front raise and takes tension off the elbow flexors.
Rotating the palms
Turning the palms up as the hands rise turns the movement into a regular curl, so keep the thumbs pointing up the whole time.
Letting the band snap back
Dropping the hands quickly wastes the lowering phase and jerks the elbows straight, so lower against the band under control.
Bending the wrists
Letting the wrists cock back or curl forward under tension strains the forearm tendons, so keep them straight and in line with the forearms.
Loose foot anchor
Standing on the band with only the toes or heels lets it slide out mid-rep, so anchor it under the middle of both feet.

Injuries

Band Hammer Curl is a low risk exercise when performed with proper technique. The load is light, the elbows stay at your sides, and the neutral grip is usually comfortable for people whose wrists or elbows complain during palms-up curls.

The main hazard is the band itself. A band that slips out from under your feet or tears can snap up toward your face, so check it for nicks, tears and worn spots before every session, plant it under the middle of your feet rather than the toes, and keep your face out of line with the band. The strain points in the arm are the tendons at the front and outside of the elbow, which get irritated when the reps are rushed, the band is too heavy or the wrists bend under the load.

To regress, use a lighter band, take a narrower stance, or switch to the Dumbbell Hammer Curl where the load is easier to control. To progress, use a heavier band, widen your stance to add pre-tension, slow the lowering phase, or move on to the Dumbbell Single-Arm Hammer Preacher Curl.

Stop the set if you feel sharp pain at the front or outside of the elbow, pain that lingers after training, or numbness or tingling in the hand. A deep burn in the forearm and upper arm near the end of a set is normal.

Overview

Primary Focus: Biceps
Equipment: Resistance bands
Modality: Strength
Difficulty: Beginner

Alternative Exercises

Frequently Asked Questions

Q: Does the hammer grip work the brachioradialis more than a regular curl?: Not necessarily. The neutral grip gives the brachioradialis good leverage and takes some of the work off the biceps, but a study of competitive bodybuilders curling on a cable found a neutral rope grip produced lower biceps activity and slightly lower brachioradialis activity than a palms-up bar grip. Think of the hammer curl as a way to shift work away from the biceps rather than a brachioradialis isolation drill.
Q: How do I make a band hammer curl harder without buying a new band?: Widen your stance or step on the band closer to your hands so it starts under more tension, and slow down the lowering phase. Once you can do more than about 20 controlled reps, a heavier band is the better next step.
Q: How many reps should I do?: Most people do 2 to 4 sets of 10 to 20 reps, stopping a rep or two before form breaks down. Bands suit higher reps well, and a slow lowering phase keeps the set challenging.
Q: Is a band hammer curl as good as a dumbbell hammer curl?: It works the same muscles, but the load feels different: a band is lightest at the bottom and hardest near the top, while a dumbbell stays the same weight through the rep. A band is a good choice at home or on the road, and the Dumbbell Hammer Curl makes it easier to add load in small, measurable steps.
Q: Can I do it one arm at a time?: Yes. Stand on the band with one foot and curl with the hand on the same side, which helps if one arm is weaker or the band is too heavy for both arms at once.