Dumbbell Fly: Technique, Muscles and Swaps
Load card
- Equipment
- Dumbbell
- Muscle group
- Chest
- Main muscles
- pectoralis major
- Also working
- anterior deltoid
- Mechanics
- Isolation
- Pattern
- Horizontal adduction
- Level
- Beginner
The dumbbell fly, also known as the dumbbell chest fly, is a beginner isolation exercise that targets your chest. By moving the weights through a wide arc, you focus entirely on horizontal adduction without relying on your triceps to press the load.
This movement primarily trains the pectoralis major. It also engages the anterior deltoid as a supporting muscle to help control the descent and bring the dumbbells back to the starting position.
How to do it
Lie flat on a bench with a dumbbell in each hand, resting them on your thighs. Kick the weights up to your chest and press them straight over your shoulders with your palms facing each other.
- Plant your feet firmly on the floor and maintain a slight bend in your elbows.
- Slowly lower the dumbbells out to your sides in a wide arc.
- Keep your elbows fixed in that slightly bent position throughout the entire descent.
- Stop when the dumbbells are roughly level with your chest and you feel a stretch.
- Squeeze your chest muscles to bring the dumbbells back up along the same arc.
- Stop just before the dumbbells touch at the top to keep tension on the muscles.
Sets, reps and load
Start with 3 sets of 10 to 15 repetitions. Rest for 60 to 90 seconds between each set.
Choose a light to moderate weight that allows you to control the full range of motion without changing your elbow angle.
Common mistakes
- Bending the elbows too much. This turns the fly into a pressing motion. Keep the elbow angle fixed so the movement isolates the chest through horizontal adduction.
- Dropping too low. Lowering the weights past shoulder level puts excessive stress on the shoulder joint. Stop when the dumbbells are in line with your torso.
- Touching the dumbbells at the top. Banging the weights together removes tension from the chest. Stop an inch or two apart at the top of the rep.
- Rushing the descent. Dropping the weights quickly reduces muscle activation and increases injury risk. Take two to three seconds to lower the dumbbells.
- Lifting your head. Keep your head flat on the bench to protect your neck. Look straight up at the ceiling during the entire set.
Make it easier or harder
Easier
- Dumbbell floor fly
- Use lighter dumbbells and reduce the range of motion
Harder
- Incline dumbbell fly
- Pause at the bottom of the movement for two seconds
Swaps and related chest exercises
Same muscle group with different equipment:
- Resistance Band Chest Fly Resistance band
- Resistance Band Chest Press Resistance band
- Incline Push-Up Bodyweight
- Push-Up Bodyweight
More dumbbell options:
- Dumbbell Bench Press Horizontal push
- Dumbbell Floor Press Horizontal push
- Incline Dumbbell Press Incline push
Browse all dumbbell exercises or every chest exercise.
When to see a doctor or physio
- Sharp or stabbing pain in the shoulder joint.
- A tearing sensation in the chest or armpit area.
- Numbness or tingling traveling down your arms.
This page is general training information, not medical advice. If you are new to strength training, managing a health condition, pregnant or coming back from an injury, check with a doctor or physio first.
How this page was made. Exercise data (equipment, muscles, mechanics, level) compiled by the Unite Journal Crew as a general anatomy guide, cross-checked against the public-domain free-exercise-db list. Text drafted with AI assistance and edited by the crew; see our house rules. Last checked October 2026.