Skip to content
Crucible
Download on the App Store
Crucible

Crucible is a precision strength training system built around your body, your equipment, your location, and your time.

Download on the App Store

© 2026 Crucible Fit, LLC. All rights reserved.

Explore

  • Exercise Library

Legal

  • Terms and Conditions
  • Privacy Policy
  • Consumer Health Data Notice

Support

  • Support
  1. Home
  2. /
  3. Exercises
  4. /
  5. Arms
  6. /
  7. Dumbbells Seated Triceps Extension

Exercise guide

Dumbbells Seated Triceps Extension

  • Intermediate
  • Isolation
  • Rep-based
  • Upper arms

This isolation exercise targets the triceps, specifically emphasizing the long head by placing it in a deep overhead stretch. It is highly effective for building upper arm mass and improving overhead stability.

Reviewed by the Crucible team · Updated June 2026

Watch the Dumbbells Seated Triceps Extension demonstrationGuided video and your full workout live in the Crucible app.

Muscles worked

Primary

  • Triceps

Secondary

  • Deltoids
  • Forearms

Equipment

  • Dumbbell

Setup

  1. Sit on the edge of a flat bench with your feet planted firmly on the floor for stability.
  2. Grasp a single dumbbell with both hands, forming a diamond shape with your palms against the underside of the top weight plate.
  3. Lift the dumbbell directly overhead, fully extending your arms while keeping your head facing forward.

How to do it

  1. Inhale and slowly lower the dumbbell behind your head by bending only at the elbows, keeping your upper arms vertical and stationary.
  2. Lower the weight until your forearms are at least parallel to the floor or you feel a deep stretch in your triceps.
  3. Exhale and drive the weight back to the starting position by extending your elbows, following a controlled 2-0-2-0 tempo.

Form checklist

  • Keep your elbows tucked close to your ears; do not let them flare out to the sides.
  • Maintain a neutral spine and avoid arching your lower back as you lower the weight.
  • Ensure only your forearms move; your upper arms should remain perpendicular to the floor throughout.
  • Keep your core tight to prevent your ribcage from flaring upward.

Pro tips

  • Focus on the 'stretch' at the bottom of the movement to maximize recruitment of the triceps' long head.
  • Think about 'pressing' the weight toward the ceiling rather than just moving it forward to ensure full tricep engagement.

Make it harder

  • Perform the movement unilaterally (one arm at a time) to increase the demand on your core and fix muscle imbalances.
  • Implement a 3-second eccentric (lowering) phase to increase time under tension and muscle fiber breakdown.

Frequently asked

What muscles does the dumbbells seated triceps extension work?
The dumbbells seated triceps extension primarily targets the triceps, and also works the deltoids and forearms as secondary muscles.
What equipment do you need for the dumbbells seated triceps extension?
The dumbbells seated triceps extension uses dumbbell.
Is the dumbbells seated triceps extension good for beginners?
The dumbbells seated triceps extension is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.

Related exercises

  • Arm Double CrossoverIntermediate · biceps, deltoids, and triceps
  • Aztec Push UpIntermediate · pectorals, serratus anterior, and triceps
  • Band Assisted DipIntermediate · triceps
  • Band Bent Over One Arm Neutral Grip KickbackBeginner · triceps

Train this with a plan, not guesswork

Crucible builds the dumbbells seated triceps extension into a precise program around your body, equipment, location, and time.

Download on the App Store