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How to do the Cable Alternate Triceps Extension

TricepsCableBeginner

The cable alternate triceps extension keeps constant tension on both heads of the triceps throughout every rep, making it one of the most effective cable movements for building real arm thickness. Mastering this beginner-friendly exercise now builds the foundation for serious pressing strength later.

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Muscles worked

Primary
Triceps
Secondary
Front deltsChest

Step-by-step

  1. Set a cable pulley to shoulder height, attach a rope or dual handles, and stand facing the machine with feet shoulder-width apart.
  2. Grasp one handle in each hand, tuck your elbows close to your sides, and hold the starting position with arms bent at roughly 90 degrees.
  3. Extend one arm fully downward until the elbow is locked out, squeezing the triceps hard at the bottom before returning under control.
  4. Alternate arms in a smooth, controlled rhythm, keeping the non-working elbow pinned and avoiding any torso rotation between reps.

Common mistakes

  • Letting the elbows drift forward during the extension, which shifts load off the triceps onto the shoulders — consciously pin each elbow to your ribs before you push.
  • Using momentum and swinging the torso to move the weight, which kills triceps activation — lower the load and move each arm independently with deliberate control.
  • Cutting the range of motion short and not fully locking out at the bottom — commit to full elbow extension on every rep to recruit the maximum number of muscle fibers.

Pro tip — On the working arm, pronate your wrist slightly at full extension as if pouring water out of a jug — this small rotation increases peak contraction in the lateral head of the triceps where most people leave gains on the table.

Sets & reps by goal

Build muscle3–4 sets × 10–15 reps
Get stronger3–4 sets × 6–8 reps
Lose fat / tone3 sets × 12–20 reps

Rest: 60–90 sec between sets.

More Triceps exercises

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