Cable Single-Arm Tricep Extension

Cable Single-Arm Tricep Extension trains the triceps by straightening the elbow while the shoulder and upper arm remain deliberately positioned.

Primary muscle

Triceps

Primary musclesTriceps brachii

Secondary musclesAnconeus, Posterior deltoids

Equipment

Strength Machine

← Back to exercise database

Set up for Cable Single-Arm Tricep Extension

Prepare the strength machine

Adjust the seat, back pad, and movement arm so the machine pivot aligns with the joint being trained.
Insert the weight pin fully and test the start/stop mechanism with a light load.

Position yourself for Cable Single-Arm Tricep Extension

Stand close to the high pulley, hold the attachment with the elbows bent at the sides, and keep the shoulders down and torso still.
Set the upper arms before extending the elbows and choose a range that does not force the shoulders or wrists out of position. Keep the non-working side stable and compare both sides before choosing the working range.

Choose and verify the starting level

Use a conservative load for the first set of Cable Single-Arm Tricep Extension. You should be able to pause at the hardest position without changing the intended joint path.
Perform one slow rehearsal repetition and change the setup if the equipment shifts, the range causes pain, or the target position cannot be maintained.

How to perform Cable Single-Arm Tricep Extension

Follow the sequence in order, paying attention to the starting position, movement path, and finish described in each step.

Set the shoulders and upper arms for Cable Single-Arm Tricep Extension, then bend the elbows until the attachment or weight is under control.
Brace the trunk and keep the wrists straight before extending the elbows.
Straighten the elbows against resistance while keeping the upper arms from drifting.
Finish with the triceps contracted without snapping or forcefully locking the joint.
Return slowly until the elbows are comfortably bent. Complete the planned repetitions evenly on both sides.

Common Cable Single-Arm Tricep Extension mistakes

These are the form changes most likely to move work away from the target muscles or make the repetition harder to control.

Upper arms wandering

Keep the upper arms in the selected position so the elbow joint performs the extension.

Using trunk momentum

Brace and reduce the load if the torso rocks or the shoulders roll to finish the repetition.

Wrists folding

Keep the wrists aligned with the forearms throughout the press, kickback, or overhead extension.

Snapping into lockout

Finish smoothly with the triceps contracted rather than forcefully jamming the elbow straight.

When to modify or choose another exercise

Reduce the resistance, range, lever length, or balance demand if Cable Single-Arm Tricep Extension cannot be completed without compensation.
Stop when the exercise produces sharp, catching, radiating, or increasing joint pain rather than the expected muscular effort.
Choose a stable supported alternative when fatigue, balance, equipment fit, or a current medical restriction prevents repeatable technique.
Compare sides with the same starting load and range; a persistent or painful asymmetry should be assessed rather than trained around blindly.

Programming guide

How to use Cable Single-Arm Tricep Extension in a training program

Use Cable Single-Arm Tricep Extension as accessory work after larger compound exercises, or earlier only when its target action is the session's priority.

Where it fits in a session

Use Cable Single-Arm Tricep Extension after larger compound movements, or earlier only when its target action is the workout's main priority.

How often to use it

Use one to three times per week and count the work alongside compound exercises that train the same muscles.

Starting rep ranges by goal

Goal	Sets	Reps or time	Rest	Effort and execution
Strength accessory	2–4	6–10 per side	75–150 sec	Leave 2–3 controlled reps in reserve
Muscle growth	2–4	8–15 per side	60–120 sec	Usually 1–3 clean reps in reserve
Local endurance	2–3	12–20 per side	45–90 sec	Stop before range or joint position changes

How to progress it

Add controlled repetitions within the selected range before increasing resistance. For unilateral work, progress each side according to the weaker technically sound performance.

Pairing and sequencing

Superset with a non-competing accessory when both exercises can keep their intended joint paths.
Do not add isolation volume without counting the work already received from compound lifts.

Coach's notes

Program 2–4 sets of 8–15 controlled repetitions per side; 12–20 repetitions can also suit lighter isolation and rotator-cuff work.
Rest 45–90 seconds, extending the interval if fatigue changes joint position or the intended muscle action.
Add repetitions before load and count these sets toward the weekly volume already supplied by compound exercises.

Scale the movement