Cable One Arm Preacher Curl exercise animation (Male)

Cable One Arm Preacher Curl

Target muscle
—
Equipment
Cable
Body part
Upper Arms
Type
Strength

The cable one arm preacher curl is a single-arm isolation exercise for the biceps, working one upper arm at a time over a preacher bench. The cable keeps constant tension on the muscle through the full range, making it useful for building the biceps peak and ironing out left-to-right strength imbalances.

How to do the Cable One Arm Preacher Curl

  1. 1Set a low cable pulley and attach a single handle. Position a preacher bench so the angled pad faces the machine.
  2. 2Sit on the bench and rest the back of your working upper arm flat against the pad, then take the handle in that hand with an underhand (palms-up) grip.
  3. 3Let your arm extend down the pad until your elbow is almost straight and you feel a stretch in the biceps, keeping a slight bend to protect the joint.
  4. 4Brace your torso and keep your upper arm pinned to the pad so only your forearm moves.
  5. 5Curl the handle up by bending at the elbow, squeezing the biceps as you reach the top.
  6. 6Pause briefly at peak contraction, keeping tension on the muscle rather than letting the elbow rest.
  7. 7Lower the handle slowly under control back to the stretched starting position.
  8. 8Finish all reps on one arm, then switch the handle to the other hand and repeat.

Form tips

  • Move only at the elbow — keep your upper arm flat on the pad so the biceps does the work instead of your shoulder swinging.
  • Control the lowering phase; the constant cable tension makes the eccentric a major source of growth.
  • Keep your wrist neutral and stacked over your forearm rather than curling it inward at the top.
  • Train both arms with the same weight and reps to correct or prevent side-to-side imbalances.
  • Pick a load you can fully extend and fully squeeze; going too heavy shortens the range of motion.

Common mistakes

  • Lifting the upper arm off the pad to heave the weight up, which turns it into a swing and takes tension off the biceps.
  • Cutting the range short at the bottom, which skips the loaded stretch where much of the muscle-building stimulus lives.
  • Letting the handle drop fast on the way down, wasting the eccentric and stressing the elbow tendon.
  • Using momentum or leaning back to start the rep, which cheats the working muscle and reduces the training effect.
  • Going so heavy you can't reach full extension, which limits results and increases the chance of straining the elbow.

Frequently asked questions

What muscles does the cable one arm preacher curl work?

It isolates the biceps of the working upper arm. The preacher pad pins your arm in place so the biceps does the lifting with minimal help from other muscles.

Why use a cable instead of a dumbbell for preacher curls?

The cable keeps constant tension on the biceps through the entire range, including the bottom stretch, whereas a dumbbell loses tension as you approach the top of the rep.

How many sets and reps should I do?

For an isolation move like this, 3 to 4 sets of 10 to 15 reps per arm works well. Use a weight that lets you fully extend and fully squeeze each rep.

Is the cable one arm preacher curl good for beginners?

Yes. Working one arm at a time on a fixed pad makes it easy to learn strict form, control the weight, and even out strength between your arms.

What is a good alternative to the cable one arm preacher curl?

A two-arm cable preacher curl or a dumbbell preacher curl train the same biceps with a similar pinned-arm position; pick based on the equipment you have available.

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