Dumbbell Seated Bench Extension exercise animation (Male)

Dumbbell Seated Bench Extension

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

The dumbbell seated bench extension is an isolation exercise that targets the triceps brachii on the back of the upper arms. Performed seated on a bench while pressing a dumbbell overhead and lowering it behind your head, the supported position keeps your torso stable so you can train the triceps through a long stretch under control.

How to do the Dumbbell Seated Bench Extension

  1. 1Sit upright on the end of a bench with your feet flat on the floor and your back tall.
  2. 2Hold a single dumbbell with both hands, cupping the top plate so the handle hangs straight down.
  3. 3Press the dumbbell overhead until your arms are fully extended and the weight sits directly above your head.
  4. 4Keep your upper arms vertical and close to your head, with your elbows pointing forward rather than flaring out.
  5. 5Bend your elbows to lower the dumbbell behind your head under control, feeling a stretch across the triceps.
  6. 6Lower until your forearms are roughly parallel to the floor or you reach a comfortable stretch.
  7. 7Extend your elbows to press the dumbbell back up to the locked-out starting position, keeping your upper arms still.
  8. 8Complete your reps, then lower the dumbbell to your lap or the floor with control.

Form tips

  • Keep your upper arms fixed and vertical throughout the set so only your forearms move and the triceps do the work.
  • Brace your core and avoid arching your lower back as the weight travels behind your head.
  • Control the lowering phase for one to two seconds rather than letting the dumbbell drop, which keeps tension on the triceps.
  • Start with a light dumbbell to groove the overhead path before adding load, since the behind-the-head position is demanding.

Common mistakes

  • Letting your elbows flare out to the sides, which shifts effort away from the triceps and stresses the shoulders.
  • Using momentum or a back arch to heave the weight up, which cheats the rep and risks straining the lower back.
  • Cutting the range short and not lowering the dumbbell far enough, which reduces the triceps stretch and the training effect.
  • Letting the dumbbell drop quickly behind your head, which loses tension and can strain the elbows.

Frequently asked questions

What muscles does the dumbbell seated bench extension work?

It isolates the triceps brachii, the muscle on the back of the upper arm that straightens the elbow. The overhead position emphasizes the long head of the triceps.

Is the dumbbell seated bench extension good for beginners?

Yes, as long as you start light. The seated, supported position makes the movement easy to control, so beginners can learn elbow extension before progressing the weight.

How many sets and reps should I do?

For building the triceps, 3 to 4 sets of 8 to 15 reps with a controlled tempo works well. Since this is an isolation move, moderate weight and full range beat heavy, partial reps.

Should I use one dumbbell or two?

This version uses a single dumbbell held with both hands and lowered behind your head, which keeps the load centered and your upper arms stable through the stretch.

Related exercises