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Dumbbell Fly

A free-weight fly on a flat bench that heavily loads the chest in its stretched position — use moderate weight and strict control.

Muscle activation

  • Lower chest55%
  • Upper chest25%
  • Front delts20%

Approximate share of work; varies with grip, stance and tempo.

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Step by step

  1. 1. Start position

    Lie on a flat bench and press the dumbbells over your chest, palms facing each other.

  2. 2. Mid-rep

    Stop when your upper arms are about level with your torso and you feel a strong chest stretch.

  3. 3. End of the movement

    Bring the dumbbells back up along the same arc, as if hugging a barrel.

  4. 4. Common mistake

    Lowering the arms far below the bench line

Ways to do it

Chest fly on 4 different setups — pick whatever is free in your gym. Progress is tracked separately for each.

How to do it

Setup

  1. 1Lie on a flat bench and press the dumbbells over your chest, palms facing each other.
  2. 2Plant your feet and set your shoulder blades back and down.
  3. 3Unlock your elbows into a soft bend you'll keep for the whole set.

Execution

  1. 1Open your arms in a wide arc, lowering the dumbbells out to the sides.
  2. 2Stop when your upper arms are about level with your torso and you feel a strong chest stretch.
  3. 3Bring the dumbbells back up along the same arc, as if hugging a barrel.
  4. 4Stop just before the weights touch to keep tension on the chest.

Breathing

Inhale as you open, exhale as you bring the weights together.

Tempo

3-1-1-0 (eccentric-pause-concentric-pause)

Muscles worked

Primary

Lower chest, Upper chest

Secondary

Front delts

Key form cues

  • Hug a barrel
  • Elbows soft and fixed
  • Stop at chest level
  • Shoulders pinned

Common mistakes

  • Lowering the arms far below the bench line

    Stop with upper arms about level with your torso.

  • Bending the elbows more to press the weight up

    Keep the elbow angle fixed and drop the load if needed.

  • Going too heavy

    Use a weight you can control for 10+ reps; this is not a strength lift.

Range of motion

From dumbbells over the chest to upper arms roughly level with the torso at a comfortable stretch.

Variations

  • Easier

    Floor dumbbell fly (the floor limits depth)

  • Harder

    Incline dumbbell fly

  • At home

    Resistance band fly

  • Machine / cable

    Pec deck fly

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