Is the cable version better than a dumbbell concentration curl?

Not by itself. In a 10-week study of untrained young adults, cable and barbell preacher curls built similar biceps thickness even though they loaded different parts of the rep. Pick the cable version for steady resistance with the arms straight, and the Dumbbell Concentration Curl when you want each arm to work on its own.

Can I use an EZ bar or rope attachment instead of a straight bar?

Yes. An EZ attachment angles the hands slightly inward and is easier on the wrists for many people, while a rope held with the palms facing each other turns it into a hammer-style curl that shifts more work to the brachialis and brachioradialis.

How far from the machine should I sit?

Far enough that the plates lift off the stack while your arms hang straight, so the biceps are loaded from the first inch of every rep. Sitting too close lets the weight rest at the bottom and makes the cable run almost straight up.

Why lean forward instead of sitting upright?

The forward lean lets your upper arms hang between your knees and rest against your inner thighs, which locks them in place and stops the shoulders from helping. Sitting upright removes that support and turns the movement into an ordinary seated cable curl.

How heavy should I go?

Use a weight you can curl for 10 to 15 strict reps without rocking your torso or pressing your arms hard into your thighs. If the bar tilts or the elbows start sliding, the stack is too heavy.

Cable Concentration Curl

What Is the Cable Concentration Curl?

Cable Concentration Curl is an isolation exercise that primarily targets the biceps and also engages the brachialis and brachioradialis. It is a beginner-level movement performed seated on the end of a flat bench facing a low pulley, holding a short straight bar in both hands with the torso leaning forward and the upper arms resting against the inner thighs.

Bracing the arms against the thighs takes the shoulders and torso out of the lift, so the elbows are the only joints that move. That makes it hard to swing the weight or shorten the range without noticing, which is why the concentration position is popular with lifters who cheat on standing curls. It usually sits late in an arm or pulling session, after heavier rows, pull-ups or standing curls, as an accessory for extra biceps volume.

The cable changes where the rep is hardest compared with the Dumbbell Concentration Curl. With a dumbbell, the hanging forearm points straight at the floor at the bottom and the biceps carry almost no load there. The cable pulls forward and down from the pulley instead, so the biceps stay loaded with the arms straight, while the resistance eases a little as the hands approach the chin. The underhand grip keeps the biceps doing most of the work; swapping the bar for an EZ attachment is easier on many wrists, and a rope attachment held with a neutral grip shifts more of the work to the brachialis and brachioradialis.

Holding the bar with both hands lets you use more weight than a one-arm version and trains both sides in half the time, but a stronger arm can quietly do more of the work. The Barbell Concentration Curl uses the same two-handed position with a free weight, and the Dumbbell Concentration Curl or Cable Single-Arm Curl trains each arm on its own. Because the cable stack moves in small steps and the seated position is very stable, this is a good choice for beginners, who only need enough hip mobility to lean forward with a flat back.

Muscles Worked

MuscleActivation

Biceps Brachii: Primary
Brachialis: High
Brachioradialis: Medium
Flexor Carpi Radialis: Low
Flexor Carpi Ulnaris: Low

Instructions

Attach a short straight bar to the low pulley of a cable station and set a light weight.
Place a flat bench with one end pointing at the cable column, about a long stride away from it.
Sit on that end of the bench facing the machine, with your feet flat and wider than shoulder width.
Hinge forward from the hips with a flat back and take the bar with an underhand grip, hands slightly narrower than shoulder width.
Rest the backs of your upper arms, just above the elbows, lightly against your inner thighs and let your arms hang straight between your knees with the plates lifted off the stack.
Curl the bar up toward your chin by bending only at the elbows, keeping your upper arms and torso still and the bar level.
Pause briefly at the top and squeeze your biceps without letting your wrists bend back.
Lower the bar slowly until your arms are fully straight, without letting the plates touch down between reps.
After the last rep, let the weight down under control before sitting up.

Common Mistakes

Using momentum
Rocking the torso back to start the bar moving takes work away from the biceps, so keep the chest still and let only the elbows bend.
Elbows sliding up the thighs
Letting the elbows drift up or off the thighs as you curl lets the shoulders help and shortens the range, so keep the upper arms in the same spot from start to finish.
Pushing the arms into the thighs
Driving the arms hard into the legs turns the curl into a leverage move, so let them rest against the thighs only lightly.
One arm doing more work
A bar that tilts toward one side means the stronger arm is taking over, so watch the bar stay level and lower the weight if it keeps dipping.
Cutting the range short
Stopping halfway down skips the part of the rep where the cable loads the biceps most, so straighten the arms fully on every rep without letting the plates touch down.
Rounding the back
Slumping over the knees to reach the bar strains the lower back, so hinge from the hips and keep the back flat.

Injuries

Cable Concentration Curl is a low risk exercise when performed with proper technique. Sitting with the upper arms braced against the thighs keeps the shoulders and lower back out of the lift, so the load falls almost entirely on the elbow flexors and the tendons at the front of the elbow.

Most problems come from jerking a heavy stack up or letting it pull the arms straight at the bottom, which puts a sudden load on the biceps tendon where it attaches below the elbow. A straight bar can also strain the wrists of lifters who cannot fully turn their palms up; an EZ attachment usually solves this. Keep the wrists straight, lower every rep under control, and add weight in small steps rather than big jumps. Hinge from the hips with a flat back so long sets do not leave the lower back sore.

If holding the forward lean is uncomfortable, the Cable Preacher Curl supports the arms on a pad while you sit upright. Once the movement is solid, progress with a slower lowering phase, a pause at the top, or one arm at a time with the Dumbbell Concentration Curl.

Stop the set if you feel a pop or sharp pain at the front of the elbow, pain that is still there the next day, or numbness and tingling into the forearm or hand, and have it checked before training the arms again.

Overview

Primary Focus: Biceps
Equipment: Cable and bench
Modality: Strength
Difficulty: Beginner

Alternative Exercises

Frequently Asked Questions

Q: Is the cable version better than a dumbbell concentration curl?: Not by itself. In a 10-week study of untrained young adults, cable and barbell preacher curls built similar biceps thickness even though they loaded different parts of the rep. Pick the cable version for steady resistance with the arms straight, and the Dumbbell Concentration Curl when you want each arm to work on its own.
Q: Can I use an EZ bar or rope attachment instead of a straight bar?: Yes. An EZ attachment angles the hands slightly inward and is easier on the wrists for many people, while a rope held with the palms facing each other turns it into a hammer-style curl that shifts more work to the brachialis and brachioradialis.
Q: How far from the machine should I sit?: Far enough that the plates lift off the stack while your arms hang straight, so the biceps are loaded from the first inch of every rep. Sitting too close lets the weight rest at the bottom and makes the cable run almost straight up.
Q: Why lean forward instead of sitting upright?: The forward lean lets your upper arms hang between your knees and rest against your inner thighs, which locks them in place and stops the shoulders from helping. Sitting upright removes that support and turns the movement into an ordinary seated cable curl.
Q: How heavy should I go?: Use a weight you can curl for 10 to 15 strict reps without rocking your torso or pressing your arms hard into your thighs. If the bar tilts or the elbows start sliding, the stack is too heavy.