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Dumbbell Fly

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Beginner
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An isolation exercise using dumbbells on a flat bench to target the pectoralis major through horizontal adduction, building chest hypertrophy and improving shoulder mobility.

About Exercise

Equipment

Dumbbells, Flat Bench

Difficulty

2/5 • Beginner

Primary Muscle Groups

Chest

Secondary Muscles

Shoulders

Accessory Muscles

Biceps, Triceps

Popularity Score

9

Goals

Hypertrophy
Strength

Training Style

Bodybuilding

Setup Requirements

Requires Rack

No

Requires Bench

Yes

Requires Spotter

No

Space Needed

Small

Noise Level

Low

Muscle Breakdown

Chest

10/10

Mid Chest, Upper Chest, Lower Chest

Shoulders

4/10

Anterior Delts

Biceps

2/10

Triceps

2/10
Programming

Typical Rep Range

8-15 reps

Rest Between Sets

60-90 seconds

How to Perform

Lie on a flat bench with dumbbells pressed directly above your chest, palms facing each other, and a slight, fixed bend in your elbows.

  1. Inhale and lower the dumbbells in a wide arc out to your sides.
  2. Stop when your upper arms are parallel to the floor or you feel a deep chest stretch.
  3. Exhale and squeeze your chest to reverse the motion, bringing the weights back to the starting position.
  4. Maintain the same elbow angle throughout the movement.

Coaching Tips

Form Cues

  • Hug a large tree
  • Keep elbows fixed
  • Squeeze at the top
  • Control the descent

Breathing

Inhale deeply as you lower the weights; exhale forcefully as you bring them back together.

Tempo

3-1-1

Range of Motion

Lower until elbows are level with shoulders; return to the top without letting the dumbbells touch to maintain tension.

Safety

Safety Notes

  • Avoid excessive depth if you have a history of shoulder issues.
  • Keep the movement controlled; do not bounce at the bottom.

Spotting

Spotting is rarely needed, but if necessary, a spotter should support the wrists, not the elbows.

Common Mistakes

  • Turning the movement into a press by bending elbows
  • Touching dumbbells at the top
  • Lowering too deep and straining shoulders
  • Using momentum

When to Avoid

  • Acute shoulder impingement
  • Pectoral strain or tear
  • Recent rotator cuff injury

Flexibility Needed

  • Adequate shoulder horizontal adduction range
  • Chest flexibility to allow arm stretch without pain

Build Up First

  • Familiarity with lying bench position
  • Basic understanding of controlled eccentric movement

Also known as

Dumbbell Chest Fly, DB Fly, Flat Bench Fly

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