Single Arm Cable Extensions: How to Perform This Isolation | Complete Nutrition

Tricep Exercises

Single arm cable extensions

Single arm cable extensions isolate the triceps with focused unilateral work and constant cable tension. The independent loading addresses imbalances effectively. The exercise suits hypertrophy work and trainees building tricep mind muscle connection. Here is how to perform them well.

See the tricep exercises hub

Updated:
May 2026

Written by:
Dominic Walton, MD

Reading time:
4 min

Muscles worked

What single arm extensions train

Single arm cable extensions isolate the triceps with constant tension and unilateral focus.

Primary mover

The triceps brachii of the working arm does all the meaningful work. The single arm focus concentrates attention on one side at a time. The unilateral nature allows better mind muscle connection development than bilateral work.

Imbalance correction

Each arm works independently. Imbalances between left and right become apparent and addressable. The independent loading prevents stronger sides from compensating. Trainees with notable asymmetries benefit substantially.

Constant tension

Cables maintain tension throughout the range. The constant tension produces better muscle engagement than dumbbell variants. The combination of constant tension and unilateral focus makes single arm cable work particularly effective.

How to perform

Setup and execution

Single arm cable extension setup requires specific attention to body position and cable height.

Setup

Set cable to high position. Attach a single handle. Stand facing the cable machine. Grip the handle with one arm. Keep elbow tucked at side throughout. Slight forward lean is appropriate. Brace the body with the free arm or just stand stable.

Starting position

Working arm with elbow flexed at 90 degrees. Upper arm at side. Forearm angled up holding the handle. Body stable. Core engaged. The free arm can hang or brace against the body for stability.

The extension

Extend the elbow pressing the handle down. Keep upper arm stationary throughout. Only forearm moves. Squeeze triceps at full extension. Hold briefly at peak contraction. Return slowly to starting position.

Common mistakes

Upper arm drifting forward or out. Using too much weight forcing form breakdown. Using body momentum to swing the weight. Insufficient range of motion. Most issues come from poor body position or excessive loading.

Programming

How to use single arm cable extensions

Single arm cable extensions fit specific programming purposes within tricep training.

For imbalance correction

When notable strength differences exist between left and right triceps, single arm work addresses the issue. The independent loading prevents compensation. Most trainees with significant imbalances benefit from regular single arm work.

For mind muscle connection

The single arm focus and isolated nature help develop tricep awareness. Trainees struggling to feel triceps during compound movements benefit from single arm cable work to develop the connection.

Higher rep ranges

10 to 15 reps per arm work well. The lighter loads required suit moderate to higher rep ranges. 3 to 4 working sets per arm typically appropriate. Match volume across both arms regardless of stronger side preference.

Late session placement

Use as finishing work after heavier compound and bilateral exercises. The isolated focused nature suits late session placement. The reduced loading allows continued quality work when other muscles are fatigued.

Single arm cable extensions sit within the Tricep Exercises hub alongside other cable variations and isolation work. For the complete library, see our Tricep Exercises Hub.

Part of the hub

More tricep exercises from the hub

This guide sits inside the Tricep Exercises hub covering every effective tricep movement from pushdowns and dips to overhead extensions and skullcrushers. Head back to the hub for the complete library and build your tricep session.

See the tricep exercises hub

Keep training

For other cable work, our Cable Pushdowns covers bilateral pushdowns. Cable Kickbacks covers cable kickbacks. And Cross Body Cable Extensions covers another single arm option.

Frequently asked

Single arm cable extension questions

Are single arm cable extensions effective?

Yes. The unilateral focus and constant cable tension produce effective tricep work. Particularly good for imbalance correction and mind muscle connection. Combined with appropriate volume and frequency, single arm work contributes well to tricep development.

Single arm vs bilateral cable extensions?

Single arm allows independent loading and addresses imbalances. Bilateral allows heavier total work with both arms simultaneously. Both have value. Most programmes benefit from including both depending on session focus and goals.

How heavy on single arm cable extensions?

Light to moderate weight allowing controlled execution. The single arm nature limits maximum loading. Most trainees use 5 to 15 kg on the cable. Choose weight that allows 10 to 15 quality reps per arm with proper form.

How many reps for single arm extensions?

10 to 15 reps per arm work well. The lighter loads suit moderate to higher rep ranges. 3 to 4 working sets per arm typically appropriate. Match volume across both arms in the session.

Should I brace with the free arm?

Optional but often helpful. Bracing against the body or a stable surface increases focus on the working arm. The free arm support stabilises the trunk. Both braced and unbraced versions work depending on preference.

How do I address tricep imbalances with this exercise?

Match volume across both arms. If one arm is weaker, do not exceed what the weaker arm can do. The weaker arm dictates total volume. Over weeks the weaker side typically catches up. Patience matters.

When in my workout should I do single arm extensions?

Late in the session as finishing work works well. After heavier compound and bilateral exercises. The isolated focused nature suits this placement. Earlier placement is reasonable when prioritising tricep work.