Cable Kneeling Triceps Extension exercise animation (Male)

Cable Kneeling Triceps Extension

Target muscle
Triceps Brachii
Equipment
Cable
Body part
Upper Arms
Type
Strength

The cable kneeling triceps extension is an isolation exercise that targets the triceps brachii at the back of the upper arm. Kneeling in front of a high cable and pulling a rope or bar overhead, the constant tension of the cable keeps the triceps loaded through the full range of motion, making it a strong choice for building arm size and pressing lockout strength.

How to do the Cable Kneeling Triceps Extension

  1. 1Set the cable pulley to a high position and attach a rope handle or straight bar.
  2. 2Kneel on the floor a step in front of the machine, facing away from it, and grip the attachment with both hands behind your head, palms facing in.
  3. 3Brace your core and keep your upper arms tucked close to your head, elbows pointing forward.
  4. 4Extend your elbows to drive the attachment up and overhead until your arms are fully straight, squeezing the triceps at the top.
  5. 5Keep your upper arms still throughout — only your forearms should move.
  6. 6Lower the attachment back behind your head under control, feeling a stretch in the triceps.
  7. 7Complete your reps, then return the weight to the stack with control.

Form tips

  • Pin your elbows in place and point them forward so the triceps do the work without the shoulders or back taking over.
  • Lower the weight slowly to use the cable's constant tension through the stretched position rather than rushing the eccentric.
  • Keep your torso upright and ribs down; let your hips drift forward and your lower back will arch.
  • Pause briefly at full lockout and squeeze the triceps before reversing the rep.

Common mistakes

  • Letting the elbows flare out and drift, which turns the movement into a press and shifts load off the triceps.
  • Using momentum or leaning to swing the weight up, which cheats the rep and reduces tension on the target muscle.
  • Arching the lower back as the arms extend overhead, which strains the spine and signals the weight is too heavy.
  • Cutting the range of motion short and not fully straightening the arms, leaving the triceps lockout untrained.

Frequently asked questions

What muscles does the cable kneeling triceps extension work?

It is an isolation exercise that targets the triceps brachii, the muscle on the back of the upper arm responsible for straightening the elbow.

Is the cable kneeling triceps extension good for beginners?

Yes. Kneeling fixes your position so it is hard to cheat with body sway, and the cable's steady resistance makes it easy to feel the triceps working while you learn the movement.

How many sets and reps should I do?

For arm size and definition, 3–4 sets of 10–15 reps with a controlled tempo works well. Pick a weight that lets you fully lock out every rep without swinging.

Why kneel instead of standing for this triceps extension?

Kneeling lowers your center of gravity and removes the leg drive and body lean you can use while standing, so the triceps get isolated and you are less able to cheat the weight up.

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