Dumbbell One Arm Triceps Extension (On Bench)

Sit on a bench with your feet flat on the ground. Hold a dumbbell in one hand with an overhand grip. Extend your arm straight up towards the ceiling, keeping your elbow close to your head. Lower the dumbbell behind your head, bending at the elbow. Pause for a moment, then raise the dumbbell back up to the starting position. Repeat for the desired number of repetitions. Switch arms and repeat the exercise.

How to perform the Dumbbell One Arm Triceps Extension (On Bench)

  1. Set up. Set up in a stable, balanced starting position appropriate for the Dumbbell One Arm Triceps Extension (On Bench) using your dumbbell.
  2. Brace and execute. Brace your core, control the descent, and move through a full pain-free range of motion while emphasizing your triceps.
  3. Reset. Reverse the movement under control and reset between repetitions, keeping your form crisp on every rep.

Coaching cues

  • Move with intent — every rep should feel deliberate, not rushed.
  • Drive force through your triceps rather than momentum.
  • Keep your breathing steady: exhale on the hard part, inhale on the reset.

Common mistakes

  • Using too much weight and losing positional control.
  • Cutting the range of motion short and missing the target muscle.
  • Letting your spine round or hyperextend instead of staying neutral.

Detailed cues, common mistakes, and demonstration video are available in the Fitly app.

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