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Dumbbell Lying Triceps Extension

The Dumbbell Lying Triceps Extension is a controlled bench exercise that trains the triceps by bending and straightening the elbows.

Arm exercises
Arms
Dumbbell equipment
Dumbbell
Fatigue level
Low 2/3 High
Dumbbell Lying Triceps Extension
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Dumbbell Lying Triceps Extension

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The Dumbbell Lying Triceps Extension is an isolation exercise performed on a flat bench where you lower dumbbells toward your head by bending at the elbows, then press them back up. Because the rest of the body stays locked in place, the triceps do virtually all the work — making it effective even at moderate loads. Dumbbell-based triceps extensions produce strong muscle activation across multiple sets, confirming their value as a primary arm-building exercise (Farias et al., 2017).

You should feel the effort concentrated in the back of your upper arms, especially as you lock out each rep. Keep your upper arms nearly vertical and control the lowering phase — rushing the descent shifts stress away from the triceps and onto the elbow joint. A smooth, comfortable range of motion matters more than going excessively deep.

Shoulder position meaningfully changes which part of the triceps works hardest during elbow extension exercises (Alves et al., 2018), so the lying position offers a distinct training stimulus compared to overhead or standing variations. Program this exercise after compound pressing movements or as a lead lift on a dedicated arm day. To adjust difficulty, lighten the weight or shorten the range rather than sacrificing control.

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Technique and form

How to perform the Dumbbell Lying Triceps Extension

  1. Lie flat on a bench with your feet planted firmly on the floor and hold a dumbbell in each hand with a neutral grip (palms facing each other).
  2. Extend your arms straight up over your chest, keeping the dumbbells close together with your elbows pointing forward and wrists straight.
  3. Inhale and slowly bend your elbows to lower the weights toward your forehead, maintaining upper arms perpendicular to the floor throughout the movement.
  4. Allow your forearms to descend until they're parallel to the floor or slightly beyond, keeping your elbows fixed in position and pointed upward.
  5. Pause briefly at the bottom position while maintaining tension in your triceps and keeping your upper arms stationary.
  6. Exhale and extend your elbows to push the dumbbells back up to the starting position, focusing on contracting your triceps to power the movement.
  7. Maintain a neutral spine position throughout the exercise by keeping your lower back in light contact with the bench and your core engaged.
  8. Complete all repetitions with controlled tempo, avoiding any swinging or momentum that might reduce triceps engagement.

Important information

  • Keep your elbows pointed toward the ceiling throughout the entire movement, not flaring outward or inward.
  • Select a weight that allows you to maintain proper form—going too heavy often leads to bending at the shoulders rather than isolating the triceps.
  • If you experience elbow pain, try using a neutral grip (palms facing each other) or switch to an EZ-bar variation of this exercise.
  • Maintain tension in your triceps throughout the entire set by not fully locking out your elbows at the top of the movement.
Dumbbell Lying Triceps Extension — Step 1
Dumbbell Lying Triceps Extension — Step 2

Common Mistakes: Dumbbell Lying Triceps Extension

Rounding your upper back

Keep your chest up and shoulders pulled back. A rounded back shifts the load away from the target muscles and strains your spine.

Not fully stretching at the bottom

Let the weight stretch your muscles at the bottom of each rep. A full range of motion leads to better results.

Using too much weight

Isolation exercises are about feeling the muscle work, not lifting the heaviest weight possible. Pick a weight you can control for 10-15 reps.

Rushing through reps

Slow, controlled reps work the muscle much better than fast, sloppy ones. Take your time on both the lifting and lowering phase.

Holding your breath

Breathe out during the hard part of the movement and breathe in as you return to the start. Holding your breath can spike your blood pressure.

Benefits of the Dumbbell Lying Triceps Extension

Builds stronger triceps

The Dumbbell Lying Triceps Extension directly targets your triceps, helping you build strength and size in this area over time.

Focused muscle targeting

As an isolation exercise, the Dumbbell Lying Triceps Extension lets you zero in on your triceps without other muscles taking over. This is great for bringing up a weak point or adding definition.

Increases overall strength

Regularly performing the Dumbbell Lying Triceps Extension with progressive weight builds functional strength that carries over to other exercises and daily life.

Equipment advantage

Dumbbells allow each side to work independently, helping fix strength imbalances, giving you a training benefit that's hard to replicate with other setups.

Train anywhere

The Dumbbell Lying Triceps Extension can be done at home with minimal or no equipment, making it easy to stay consistent even when you can't get to the gym.

Muscles Worked: Dumbbell Lying Triceps Extension

The Dumbbell Lying Triceps Extension is an isolation exercise that focuses your effort on the triceps. Here's a breakdown of every muscle involved.

Primary muscles

Triceps — Your triceps extend your elbows and lock out the movement. These are the main muscle doing the heavy lifting during the Dumbbell Lying Triceps Extension.

Risk Areas

Triceps
Muscles worked during the Dumbbell Lying Triceps Extension

FAQ - Dumbbell Lying Triceps Extension

What muscles does the dumbbell lying triceps extension target?

The exercise primarily targets all three heads of the triceps brachii with particular emphasis on the long head. The medial and lateral heads are also engaged, making it a comprehensive triceps developer that contributes significantly to upper arm size and definition.

How can I make this exercise easier or more challenging?

To make it easier, reduce the weight or switch to a half-kneeling position (one knee up). To increase difficulty, add more weight, slow down the eccentric (lowering) phase to 3-4 seconds, or progress to a tall kneeling position with knees close together to challenge core stability further.

What are the most common form mistakes with this exercise?

The three most critical errors are allowing the hips to sag (losing the pike position), shoulders rolling forward (compromising joint safety), and excessive body wobbling due to poor core bracing. Focus on maintaining a straight line from hands to hips, keeping shoulders packed away from ears, and engaging your core throughout the movement.

How often should I include dumbbell lying triceps extensions in my routine?

Include this exercise 1-2 times weekly, allowing 48-72 hours for triceps recovery between sessions. Most lifters achieve optimal results with 3-4 sets of 8-12 repetitions using a weight that creates significant challenge in the final few reps while maintaining proper form.

Is this exercise safe for those with shoulder or elbow issues?

This exercise can stress the elbows and shoulders if performed incorrectly. If you have existing joint issues, consider using lighter weights, reducing the range of motion, or substituting with cable pushdowns. Always warm up thoroughly and stop if you experience sharp pain rather than normal muscle fatigue.

Scientific References

Maximal Strength Performance and Muscle Activation for the Bench Press and Triceps Extension Exercises Adopting Dumbbell, Barbell, and Machine Modalities Over Multiple Sets

Farias DA, Willardson JM, Paz GA, et al. · J Strength Cond Res (2017)

Effect of shoulder position on triceps brachii heads activity in dumbbell elbow extension exercises

Alves D, Matta T, Oliveira L · J Sports Med Phys Fitness (2018)

Effects of dumbbell weight on the rest-pause triceps kickback exercise in women: kinetic, finite element and EMG analyses

Serbest K, Eroglu K, Dereshgi HA · Phys Eng Sci Med (2025)

Sources are peer-reviewed academic publications from PubMed.

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Workouts with Dumbbell Lying Triceps Extension

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The upper body consists of several major muscle groups, including the chest, shoulders, biceps, triceps, and abs. In these workouts, the muscles are trained together as part of an upper/lower split routine. Core compound movements such as the bench press, incline bench press, and shoulder press form the foundation of your session, helping you build strength and size efficiently. These are complemented by isolation exercises like bicep curls and tricep pushdowns to target specific muscles and improve definition. 

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The arms are made up of essential muscle groups, including the biceps, triceps, and forearms. In these workouts, these muscles are trained together to create balanced strength and impressive definition. Core compound movements like close-grip bench presses, tricep dips, and barbell curls lay the foundation by engaging multiple muscles at once. These exercises are complemented by isolation work such as hammer curls, tricep pushdowns, and wrist curls to target specific areas and maximize arm development.

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Tricep workouts target the muscles on the back of your upper arms, which make up the majority of your arm size and are essential for pressing strength. In these workouts, you'll combine compound lifts and isolation exercises to grow your triceps and improve upper body power. Exercises like close-grip bench presses, dips, and overhead tricep extensions form the base of your training, while movements like rope pushdowns and skull crushers help target each tricep head for better muscle detail. Whether you're training for aesthetics, strength, or functional performance, a well-structured tricep workout is key to stronger, more defined arms.