Cable Unilateral Biceps Curl
The Cable Unilateral Biceps Curl is an isolation movement that targets the biceps directly. This guide covers the setup, the execution, the mistakes worth fixing early, and how to program it.
Bending the elbow against resistance is the most direct way to train the biceps. The movement is simple, which is exactly why it is so often ruined — the work only lands on the target muscle when the upper arm stays still.
Who it is for. Anyone building arms. Program it after your back work, which has already given the biceps a good deal of stimulus.
Muscles worked
The prime mover here is the biceps, with forearms assisting — which is why this movement earns its place as more than a single-muscle exercise.
How to do it
- Take a cable and let your arms hang with your elbows pinned to your sides.
- Stand or sit tall with your ribs down and your midsection braced.
- Set your wrists straight rather than bent back under the load.
- Curl up by bending only at the elbow, keeping the upper arm still throughout.
- Squeeze the biceps hard at the top for a beat.
- Lower slowly all the way to a full stretch before the next rep.
Breathing. Breathe out as you curl up, in as you lower.
Form cues that matter
- Upper arms stay still — only the forearms move.
- No swing from the hips or the lower back.
- Full stretch at the bottom of every single rep.
- Swinging the hips and leaning back to heave the weight up
- The elbows drifting forward as you curl
Common mistakes
| The mistake | Do this instead |
|---|---|
| Swinging the hips and leaning back to heave the weight up | Lighten it until your torso can stay still; strict reps build more than heavy sloppy ones. |
| The elbows drifting forward as you curl | Pin them to your sides and keep them there; if they move, the front delts are taking over. |
| Stopping halfway down between reps | Straighten the arms fully; the stretched position is where a lot of the growth comes from. |
What makes this variation different
The Cable Unilateral Biceps Curl is a specific version of this movement, and the details in its name change how it should be performed.
- A cable keeps constant tension on the muscle from the first inch to the last, including the positions where a free weight goes light. Adjusting the pulley height changes the angle of resistance, which makes it the most versatile tool in the gym.
- Training one side at a time exposes any strength difference between your sides and forces the midsection to resist being pulled out of position. Always start the set with your weaker side and match the stronger side to it.
Sets, reps and rest
| Goal | Sets | Reps | Rest |
|---|---|---|---|
| Strength | 3-5 | 6-8 | 60-90 s |
| Muscle growth | 3-4 | 8-15 | 60-90 s |
| Endurance | 2-3 | 15-25 | 60-90 s |
- 6-14Weekly sets
- 2-1-2Tempo
- 60-90 sRest
How to progress
Add weight before you add reps. Work at the top of your rep range for two sessions in a row with clean technique, then put the smallest increment available on the Cable Unilateral Biceps Curl and build back up. Small, boring jumps beat big ones.
Variations and alternatives
If you do not have the equipment, or you simply want to rotate the stimulus, these 8 movements train the biceps in a similar way.
- Barbell Curl — Barbell
- Dumbbell Biceps Curl — Dumbbell
- Dumbbell Incline Biceps Curl — Dumbbell
- EZ Bar Biceps Curl (with Arm Blaster) — Barbell
- Barbell Drag Curl — Barbell
- Barbell Preacher Curl — Barbell
- Barbell Prone Incline Curl — Barbell
- Barbell Standing Close Grip Curl — Barbell
Safety
Key takeaways
- Upper arms stay still — only the forearms move.
- No swing from the hips or the lower back.
- Work in the 8-15 rep range for muscle growth, leaving a rep or two in reserve on most sets.
- Full range of motion on the Cable Unilateral Biceps Curl matters more than the weight on it.
- Progress gradually and keep technique identical as the load goes up.
Go deeper
FAQ
What muscles does the Cable Unilateral Biceps Curl work?
It works the biceps as the prime mover, with forearms assisting. The midsection also works throughout to keep you stable.
How many sets and reps should I do on the Cable Unilateral Biceps Curl?
Three to four working sets of 8-15 reps suits most people training for muscle growth, leaving one or two reps in reserve. Across all the exercises that train this muscle, 6-14 hard sets a week is a productive range.
Is the Cable Unilateral Biceps Curl good for beginners?
Yes, provided you start light enough to own the technique. Spend the first few weeks on the movement itself with a load you could do several more reps with, and add weight only once the pattern is automatic.
What can I do instead of the Cable Unilateral Biceps Curl?
Barbell Curl, Dumbbell Biceps Curl and Dumbbell Incline Biceps Curl all train the biceps in a similar way, so any of them works as a substitute when the equipment is taken or you want to rotate the stimulus.
What equipment do I need for the Cable Unilateral Biceps Curl?
This version uses a cable. The pattern matters more than the tool, though — the alternatives above cover the same movement with whatever you have available.
Track your sets, reps and progress on the Cable Unilateral Biceps Curl — free, with every exercise in the library.