Dumbbell One Arm Bench Fly

Lie on a bench with one dumbbell in your hand. Extend your arm straight up over your chest. Lower the dumbbell out to the side in a wide arc, keeping it slightly bent at the elbow. Raise the dumbbell back up to the starting position, squeezing your chest muscles. Repeat with the other arm.

How to perform the Dumbbell One Arm Bench Fly

  1. Set up. Set up in a stable, balanced starting position appropriate for the Dumbbell One Arm Bench Fly 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 pectoralis major.
  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 pectoralis major 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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