Cable Hammer Curls - Rope Attachment
A neutral-grip curl on a low pulley with a rope, so the hands can spread apart at the top. The cable keeps tension on at full flexion where a dumbbell goes slack, and the palms-in grip moves a chunk of the work onto the brachialis and brachioradialis rather than the biceps peak.
Own the movement
Set up first, then execute. Every cue below is something you can check on your next set.
Before the first rep
- Clip a rope to the lowest setting on a cable stack and stand about 30 cm back from the pulley.
- Take one end of the rope in each hand with a neutral grip, thumbs pressed against the rubber stoppers.
- Stand tall, feet hip-width, ribs down, and pin your elbows against your sides.
- Let the arms hang until the cable is already taut before the first rep, so there is no slack to jerk out of.
Every rep
Breathing & tempo — Exhale on the way up, inhale on the way down. One second up, one second held, three seconds down. The slow lowering is where a modest stack starts to bite.
Sets, reps & load
Where to start, and what to change when it stops being hard.
Start around 15-20 kg on the stack. Expect the number to land close to your supinated cable curl: the neutral grip is stronger at the elbow, but the constant tension cancels most of that advantage out. Add a plate only when you can hold a one-second squeeze at the top of every rep without the elbows drifting forward.
What goes wrong
The errors that show up most often, and the cue that fixes each one.
Stand about 30 cm from the pulley so the cable runs nearly vertical at the bottom. If you feel your shoulders being pulled forward, take a step in before the next set.
Set a short split stance and squeeze your glutes for the whole set. If you still rock, take a plate or two off; this is a 10-15 rep movement, not a max-effort pull.
Keep the knuckles pointing at the ceiling for the whole rep. A bent-back wrist moves load into the forearm flexors and off the brachialis you came for.
Stop the lowering a centimetre above the plates touching. Continuous tension is the only reason to use a cable here, and a resting stack throws it away.
Why bother
The neutral grip is the point. With the palms facing each other the biceps sits at a mechanical disadvantage and the brachialis underneath it and the brachioradialis in the forearm take up the slack. Building the brachialis pushes the biceps up from below, which is where arm width seen from the side comes from.
The cable supplies what a dumbbell hammer curl lacks. A dumbbell has almost no moment arm at the top of the curl, so the last 30 degrees are a rest stop; a low pulley keeps pulling down and slightly back through the whole arc. That is why the rope version runs lighter on the stack and still feels harder.
Where it fits
After your rows and pulldowns, or at the end of an arm day, in the 10-15 range. Rotate it with a supinated curl rather than taking both to failure in one session, because the elbow flexors recover as one group regardless of grip. Two sessions a week is enough.
If this one isn't it
No kit, too hard, or too easy — here's where to go instead.
Same job, different kit
Start here instead
When this gets easy
Asked and answered
Is a rope better than a bar for this?
For a hammer curl, yes. A rope is the only attachment that lets you hold a true neutral grip and spread the hands at the top; a straight bar forces full supination, which makes it a different exercise. Use the bar when you want supinated curls and the rope when you want the brachialis.
Will hammer curls build bigger arms than regular curls?
They build a different part of the arm. Supinated curls develop the biceps you see from the front; hammer curls thicken the brachialis and brachioradialis, which widens the arm from the side and adds elbow-flexion strength. Run both across a week instead of arguing about which one wins.
Why do my forearms give out before my biceps?
The neutral grip loads the brachioradialis hard and it is a small muscle, so a little of that is expected. If forearm fatigue ends every set early, drop the load by 10-20% and add reps, or move the exercise earlier in the session before rows and deadlifts have cooked your grip.
Should I curl both rope ends together or one arm at a time?
Both together for your working sets. The rope already lets each arm find its own path, so single-arm work buys you little and doubles the time the set takes. Switch to one arm with a D-handle only if a side is visibly lagging or you keep catching the dominant arm finishing first, and treat that as a correction you run for a block rather than your permanent format.