Dumbbell Fly
Muscles worked
Instructions
- 1Lie down on a flat bench with a dumbbell on each hand resting on top of your thighs. The palms of your hand will be facing each other.
- 2Then using your thighs to help raise the dumbbells, lift the dumbbells one at a time so you can hold them in front of you at shoulder width with the palms of your hands facing each other. Raise the dumbbells up like you're pressing them, but stop and hold just before you lock out. This will be your starting position.
- 3With a slight bend on your elbows in order to prevent stress at the biceps tendon, lower your arms out at both sides in a wide arc until you feel a stretch on your chest. Breathe in as you perform this portion of the movement. Tip: Keep in mind that throughout the movement, the arms should remain stationary; the movement should only occur at the shoulder joint.
- 4Return your arms back to the starting position as you squeeze your chest muscles and breathe out. Tip: Make sure to use the same arc of motion used to lower the weights.
- 5Hold for a second at the contracted position and repeat the movement for the prescribed amount of repetitions.
table_chartRecommended sets and reps
These ranges vary depending on your training goal — adjust the load accordingly.
| Goal | Sets | Reps | Rest |
|---|---|---|---|
| Strength | 3–4 | 6–8 | 2–3 min |
| Hypertrophy | 3–4 | 10–15 | 60 s |
| Endurance | 2–3 | 15–20 | 30–45 s |
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About Dumbbell Fly
The dumbbell fly is a pure isolation exercise for the chest, done lying on a flat bench. Arms slightly bent and elbows fixed, you open the dumbbells wide out to the sides to a marked chest stretch, then bring them back together above you in a large arc. Unlike the press, there is no elbow bend: it is the opening and closing of the arms that stretches and contracts the chest fibres. It is the ideal movement for stretch under load and pump, complementing the presses. Choose a moderate load: too heavy, you bend the elbows and turn the fly into a press, on top of stressing the shoulder.
check_circleBenefits
- check_circleIsolates the chest without triceps involvement
- check_circleDeeply stretches the chest muscle fibers
- check_circleImproves the mind-muscle connection with the pecs
lightbulbExecution tips
- lightbulbKeep a fixed elbow angle throughout the movement
- lightbulbOpen the arms until you feel a controlled stretch
- lightbulbImagine hugging a large tree as you close
- lightbulbUse a moderate weight to protect the shoulder
warningCommon mistakes
- warningBending the arms and turning the fly into a press
- warningGoing too low and overstretching the joint
- warningChoosing a load too heavy at the cost of form
- warningClanking the dumbbells together at the top
tuneVariations and alternatives
- tuneIncline dumbbell fly — Shifts emphasis toward the upper chest, complementary to the flat fly.
- tuneDecline dumbbell fly — Targets the lower chest more for complete muscle development.
- tuneCable fly — Constant tension throughout the range, unlike dumbbells where tension drops near the top.
- tunePec deck — A guided machine that reduces shoulder instability while keeping the fly's isolation effect.
person_checkWho it's for and level
The dumbbell fly suits intermediate to advanced lifters who already have a solid bench press base and want to isolate and stretch the chest to refine its shape and improve muscle definition. It's especially useful for bodybuilders preparing for competition and lifters wanting to complement their pressing movements with targeted isolation work. Beginners can introduce it gradually at light load, prioritizing movement control over the weight lifted.
shieldSafety and precautions
Never lower the dumbbells beyond the point where you feel a good stretch without pain, since the shoulder joint is in a vulnerable position at the bottom of the movement. Always keep a slight, fixed elbow bend to reduce the lever arm and protect the biceps tendon. Avoid heavy loads on this isolation exercise: injury risk rises sharply without a proportional strength benefit. People with a history of shoulder instability should favor a guided machine like the pec deck over free dumbbells.
calendar_monthWhere to place it in your program
Place the fly at the end of a chest session, after pressing movements, to isolate and fully fatigue the muscle. Do 3 sets of 10 to 15 reps with a slow, controlled tempo, especially on the way down. 60 to 90 seconds of rest is enough between sets since it's an isolation exercise. To progress, prioritize improving control and range of motion before increasing weight, since technique matters far more than load on this movement.
helpFrequently asked questions
Fly or press for the chest?
The press builds strength and mass, the fly isolates and stretches; combine both for complete development.
How much weight for flyes?
Use a lighter weight than for pressing, since the priority is range and feel, not the load.
Dumbbell fly or cable fly?
The dumbbell fly maximises the stretch at the bottom but lets tension off at the top; the cable keeps constant tension across the whole range. The two complement each other: dumbbells for the stretch, cable for continuous contraction.
Why do my shoulders fatigue before my chest on the fly?
That's often a sign of too much load or excessive range of motion; reduce the weight and limit the descent to a shoulder-comfortable point.
Can the fly replace the bench press?
No, they're complementary movements: the fly isolates and stretches the chest, the press allows heavier loading for strength and mass.
What dumbbell weight should I start with?
Start light, often 30 to 40% of your bench press weight, since the fly places significant stress on the shoulder at the bottom of the movement.
How many reps should I aim for on this exercise?
Favor a 10 to 15 rep range with slow execution, since the fly suits continuous-tension work better than maximal loading.
Can I do the fly on a cable instead of dumbbells?
Yes, a cable fly offers more constant tension throughout the movement, whereas dumbbells reduce tension near the top.
Should I pause at the bottom of the fly for a better stretch?
A brief, controlled pause can increase the stretch stimulus, but avoid bouncing out of the bottom position, which stresses the shoulder joint.
Is the fly a good exercise to superset with the bench press?
Yes, pairing a set of bench press with a set of flies (pre- or post-exhaust) is a common and effective intensification technique.
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