Dumbbell One Arm Triceps Extension
- Músculo objetivo
- —
- Equipamiento
- Dumbbell
- Parte del cuerpo
- Upper Arms
- Tipo
- Strength
The dumbbell one arm triceps extension is an isolation exercise that targets the triceps brachii of the working arm. Holding a single dumbbell overhead and lowering it behind your head stretches and loads all three heads of the triceps, making it a useful way to build elbow-extension strength and address side-to-side differences. It can be performed seated or standing.
Cómo hacer el Dumbbell One Arm Triceps Extension
- 1Sit or stand tall with your feet about shoulder-width apart and your core braced. Hold one dumbbell in your working hand.
- 2Press the dumbbell straight overhead until your arm is fully extended, with your palm facing forward and the weight balanced above your shoulder.
- 3Keep your upper arm vertical and close to the side of your head, with your elbow pointing toward the ceiling.
- 4Bend your elbow to lower the dumbbell behind your head under control, keeping your upper arm still so only your forearm moves.
- 5Lower until you feel a stretch in your triceps, stopping before the weight contacts your back or your form breaks down.
- 6Extend your elbow to press the dumbbell back up to a full lockout, squeezing the triceps at the top.
- 7Complete all your reps, then switch the dumbbell to the other hand and repeat for an equal number of reps.
Consejos de técnica
- Use your free hand to support the working elbow or brace it against your head, which keeps the upper arm stable and isolates the triceps.
- Keep your wrist neutral and firm so the dumbbell stays balanced over your forearm rather than rolling back into your hand.
- Move at a controlled tempo — resist the weight on the way down and avoid letting it drop behind your head.
- Pick a weight you can press overhead and control through a full range; this is an isolation move, not a max-effort lift.
- Avoid overarching your lower back by bracing your abs; if standing, a slight bend in the knees helps keep you stable.
Errores comunes
- Letting the upper arm drift forward or flare out, which shifts work off the triceps and shortens the range of motion.
- Lowering the dumbbell too fast or too far, which strains the elbow and shoulder instead of loading the muscle.
- Arching the lower back to help press the weight, which removes tension from the triceps and risks back strain.
- Using a weight that's too heavy, forcing partial reps and breaking the strict elbow-only movement.
- Bending the wrist backward under load, which is uncomfortable and lets the dumbbell wander off balance.
Preguntas frecuentes
What muscles does the dumbbell one arm triceps extension work?
It targets the triceps brachii of the working arm — the muscle on the back of your upper arm responsible for straightening the elbow. The overhead position lengthens the long head, so all three heads of the triceps are loaded through the movement.
Should I do the dumbbell one arm triceps extension seated or standing?
Both work. Seated (especially with back support) makes it easier to keep your torso upright and stop yourself from arching to cheat the weight up. Standing recruits more core stability but can tempt you to lean back, so brace your abs either way.
Why train one arm at a time instead of both together?
Working one arm at a time lets each triceps move through its own full range and exposes strength differences between sides, helping you correct imbalances. It also lets your free hand support the working elbow for tighter, more isolated reps.
How many sets and reps should I do?
For building the triceps, 3 to 4 sets of 10 to 15 reps per arm with a controlled weight is a solid range. Because it's an isolation exercise, slightly higher reps with strict form usually beat going heavy.
How far should I lower the dumbbell behind my head?
Lower until you feel a clear stretch in the triceps, generally with your forearm dropping below parallel, then stop before the weight touches your back or your upper arm shifts. Going only as deep as you can control protects the elbow and keeps tension on the muscle.
