Low Pulley Bicep Cable Curl: How To, Muscles Worked & Common Mistakes

The low pulley bicep cable curl is a single-arm cable curl variation that combines the constant tension benefits of cable training with the unilateral focus of training one arm at a time. While the standing biceps cable curl uses a bar and works both arms simultaneously, this variation isolates each bicep individually — making it ideal for identifying and correcting strength imbalances between your left and right arm, and for developing a stronger mind-muscle connection with each bicep separately.

How the Low Pulley Bicep Cable Curl Differs from the Standing Biceps Cable Curl

Both exercises use a low pulley and deliver constant cable tension, but there are key differences:

• Standing biceps cable curl — bilateral, both arms work simultaneously with a bar attachment, allows heavier loading, more efficient for general bicep development
• Low pulley bicep cable curl — unilateral, one arm at a time with a single handle, allows each arm to work independently, better for fixing imbalances and improving mind-muscle connection

The single arm setup also allows your wrist to rotate slightly more naturally throughout the curl compared to a fixed bar, which many people find more comfortable on their wrists and elbows. Check out our Standing Biceps Cable Curl page for the bilateral version.

Low Pulley Bicep Cable Curl – Muscles Worked

Primary muscles:

• Biceps brachii — the main target, worked with constant cable tension through the full range of motion on each arm individually
• Brachialis — heavily involved throughout, adds thickness underneath the bicep

Secondary muscles:

• Brachioradialis — forearm muscle that assists with the curl
• Forearm flexors — work to maintain grip throughout the set
• Core — works harder than in bilateral variations to prevent your torso from rotating toward the working arm

How to Perform the Low Pulley Bicep Cable Curl

1. Attach a single handle to a low pulley cable machine.
2. Stand facing the machine, feet shoulder-width apart, one foot slightly forward for balance. Grip the handle with one hand using an underhand grip — palm facing up.
3. Step back slightly until there is tension in the cable with your arm fully extended at your side — this is your starting position with the bicep already under slight tension.
4. Keep your elbow pinned to your side as a fixed pivot point and curl the handle upward toward your shoulder in a smooth arc.
5. Squeeze your bicep hard at the top — hold for a brief moment.
6. Slowly lower the handle back down to the fully extended starting position over 2–3 seconds, resisting the cable throughout the descent.
7. Complete all reps on one side, then switch arms.

Low Pulley Bicep Cable Curl Pro tip: As you curl, resist the temptation to let your torso rotate toward the working arm to help complete the rep. Keep your core braced and your shoulders square to the machine throughout every rep. The moment your torso twists, your bicep stops doing the work alone.

Low Pulley Bicep Cable Curl – Sets & Reps

Low Pulley Bicep Cable Curl – Common Mistakes to Avoid

1. Torso rotating toward the working arm This is the most common single-arm cable curl mistake. When the weight gets challenging, your torso naturally wants to twist to help complete the rep. Keep your core tight and your shoulders square — only your forearm should move.

2. Elbow drifting forward Your elbow should stay pinned to your side throughout every rep. Letting it drift forward brings your shoulder into the movement and reduces bicep isolation. Think of your elbow as a hinge fixed to your hip.

3. Standing too close to the machine Same principle as all cable curl variations — the closer you stand, the more vertical the cable angle and the less horizontal tension you get at the bottom of the movement. Step back far enough that the cable pulls mostly horizontally when your arm is extended.

4. Rushing through reps to get to the other arm Because you’re working one arm at a time there’s a temptation to rush through each side. Give each arm the same focused attention — slow controlled reps with a genuine squeeze at the top and a deliberate 2–3 second lowering phase.

5. Letting the cable snap your arm back Resist the cable on the way down deliberately. The eccentric phase of each rep is as important as the curl itself for building muscle — don’t let gravity or the cable do that work for you.

Where It Fits in Your Workout

The low pulley bicep cable curl works well as a finishing isolation exercise toward the end of your biceps session. Because it’s unilateral it takes a little longer than bilateral exercises, so it’s best placed after heavier compound work like barbell curls or the standing cable curl. It’s particularly useful if you’ve noticed a strength or size difference between your two arms — training each arm independently is one of the most effective ways to address those imbalances over time.