Weighted Seated Triceps Extension exercise animation (Male)

Weighted Seated Triceps Extension

Target muscle
—
Equipment
Weighted
Body part
Upper Arms
Type
Strength

The weighted seated triceps extension is a bilateral overhead isolation exercise that targets all three heads of the triceps brachii, with particular emphasis on the long head due to the fully elevated shoulder position. Performed seated with a weight plate or dumbbell held with both hands directly overhead, it is highly effective for building triceps mass and upper-arm thickness.

How to do the Weighted Seated Triceps Extension

  1. 1Sit upright on a flat bench or an adjustable bench set to 90°, with your feet flat on the floor and your lower back in a neutral arch.
  2. 2Hold a single dumbbell vertically by cupping both hands under the top plate, or grip a weight plate with both palms flat against its surface.
  3. 3Press the weight overhead so your arms are fully extended, elbows pointing straight up toward the ceiling and upper arms framing your head.
  4. 4Brace your core and keep your chest tall — avoid arching your lower back or flaring your ribs.
  5. 5Take a breath in, then slowly lower the weight behind your head by bending only at the elbows, keeping your upper arms stationary and vertical.
  6. 6Descend until you feel a deep stretch in the triceps — typically when your forearms reach parallel to the floor or slightly below, depending on your flexibility.
  7. 7Pause briefly at the bottom, then exhale and extend your elbows to drive the weight back overhead in a controlled arc.
  8. 8Lock out the elbows fully at the top without shrugging your shoulders or tilting your head forward.
  9. 9Repeat for the desired number of repetitions, maintaining the same upper-arm position on every rep.

Form tips

  • Keep your upper arms pinned beside your head throughout — if your elbows flare outward as you fatigue, the load shifts away from the triceps and stresses the shoulder joints.
  • Lower the weight slowly (2–3 seconds) to maximize the eccentric stretch on the long head; rushing the descent reduces time under tension and increases injury risk.
  • Squeeze the weight firmly with both hands and ensure your grip is symmetrical before unracking so the load stays balanced overhead.
  • If your lower back starts to arch excessively as you reach the bottom, reduce the range of motion slightly or lighten the load — hyperextending to gain extra depth undermines spinal position.
  • Pause for a full one-count at the top lockout to ensure the triceps complete the contraction rather than relying on momentum.

Common mistakes

  • Letting the elbows drift forward and outward as the weight descends — this collapses the upper-arm position, reduces long-head stretch, and places shearing stress on the shoulder joint.
  • Using too much weight and shortening the range of motion, which limits the stretch on the long head and defeats the main advantage of the overhead position.
  • Arching the lower back to compensate for tight shoulders — this compresses the lumbar spine and is a sign that either the load or the range of motion is beyond current mobility.
  • Allowing the head to jut forward at the bottom of the rep — the neck should stay neutral; chin-to-chest compensation usually signals that the elbows are flaring outward.
  • Rushing through the concentric phase with momentum rather than muscular force, which reduces stimulus to the triceps and increases the risk of losing control of the weight overhead.

Frequently asked questions

What muscles does the weighted seated triceps extension work?

It primarily targets all three heads of the triceps brachii — the long, lateral, and medial heads. Because the arms are raised overhead, the long head (which crosses the shoulder joint) is placed under a greater stretch than in any elbow-extension exercise performed with the arms at the sides, making it especially effective for developing the inner mass of the upper arm.

Should I use a dumbbell or a weight plate for this exercise?

Both work well. A dumbbell held vertically (cupping the top plate with both hands) offers a secure grip and is easier to position overhead. A weight plate is a practical alternative when a suitable dumbbell is unavailable — hold it flat with both palms pressed against the surface. Choose whichever allows you to maintain a symmetrical, controlled grip.

How many sets and reps should I do for the weighted seated triceps extension?

For hypertrophy (building triceps size), 3–4 sets of 8–12 reps with a load that challenges you by the final two reps is a reliable starting point. For strength, 4–5 sets of 5–8 reps at higher load can be used. Prioritize full range of motion and control over adding weight prematurely.

How is the seated triceps extension different from a cable pushdown?

A cable pushdown keeps the arms at the sides, which means the long head of the triceps is in a shortened position and never fully stretched. The overhead extension places the long head on stretch throughout the movement, recruiting it more completely and producing greater long-head hypertrophy over time. Pushdowns are better for isolating the lateral and medial heads with high reps; overhead extensions are superior for overall triceps mass.

Is the seated triceps extension good for building arm size?

Yes — the triceps make up roughly two-thirds of the upper arm's cross-sectional area, and the long head is the largest of the three heads. Because the overhead position fully stretches the long head before each contraction, this exercise is one of the most effective movements for increasing overall arm thickness and is a staple in hypertrophy-focused training programs.

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