Dumbbell Lying One Arm Pronated Triceps Extension exercise animation (Male)

Dumbbell Lying One Arm Pronated Triceps Extension

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

The dumbbell lying one arm pronated triceps extension is a single-arm isolation exercise that targets the triceps brachii. Performed lying on a bench with a pronated (palm-down, overhand) grip and one arm at a time, it lets you build and balance each arm's pressing strength and lockout independently.

How to do the Dumbbell Lying One Arm Pronated Triceps Extension

  1. 1Lie flat on a bench holding a dumbbell in one hand with a pronated grip — palm facing down toward your feet.
  2. 2Press the dumbbell up so your arm is fully extended and vertical, directly over your shoulder.
  3. 3Set your free hand on the working triceps or grip the bench edge to stay stable, and brace your core.
  4. 4Keeping your upper arm vertical and still, bend at the elbow to lower the dumbbell toward the same-side shoulder.
  5. 5Lower under control until your forearm is roughly parallel to the floor and you feel a stretch in the triceps.
  6. 6Extend the elbow to press the dumbbell back up, keeping the palm pronated throughout.
  7. 7Lock out at the top without letting the upper arm drift, then complete your reps.
  8. 8Lower the dumbbell to your chest, sit up safely, then switch to the other arm.

Form tips

  • Keep your upper arm locked vertical and let only your forearm move — the elbow is the single hinge.
  • Use a lighter dumbbell than you would for a barbell or two-arm version; the pronated grip and single-arm load are less stable.
  • Lower for a two-count and pause briefly at the bottom stretch to keep tension on the triceps.
  • Train your weaker arm first and match its reps with the stronger arm to even out imbalances.

Common mistakes

  • Letting the elbow flare out or drift toward your head, which shifts work off the triceps and stresses the shoulder.
  • Using too much weight and swinging the dumbbell, which trades triceps tension for momentum and risks dropping it on your face.
  • Stopping the descent short, so the triceps never reaches the loaded stretch that drives growth.
  • Letting the wrist roll out of the pronated position, which loses the intended grip emphasis and can strain the forearm.

Frequently asked questions

What muscles does the dumbbell lying one arm pronated triceps extension work?

It isolates the triceps brachii — the muscle on the back of the upper arm that straightens the elbow. Because it is a single-joint extension, it focuses work almost entirely on the triceps.

What does the pronated grip change versus a neutral grip?

A pronated (palm-down) grip rotates the forearm so the back of your hand faces you at the bottom. It shifts the emphasis slightly and challenges your wrist stability more than a neutral, palm-in grip, so start light to keep control.

Is this exercise good for beginners?

Yes, as long as you use a light dumbbell and steady the working arm with your free hand. Working one arm at a time makes it easy to learn the movement and fix side-to-side strength imbalances.

How many sets and reps should I do?

As an isolation exercise, 3 to 4 sets of 10 to 15 reps per arm works well. Use a weight you can control for the full range without swinging or letting the elbow drift.

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