Primary
Chest
Secondary
Shoulders, Core
Equipment
Dumbbell
Difficulty
Intermediate
Type
Push
See how Single Arm Dumbbell Fly could fit a workout
The example below shows one possible placement. Your purchased plan is built from your assessment, and Ely checks every exercise before approving it.
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This page is not medical advice or a rehabilitation protocol. Ely's personal review applies to purchased workout plans and does not replace an in-person assessment by a licensed healthcare professional.
Single-arm dumbbell fly forces each side to work independently with no help from the stronger pec. The unilateral demand also recruits core stabilizers to prevent rolling off the bench. Find imbalances, fix them, and build better mind-muscle connection.
When to use it
Use for fixing muscle imbalances or improving mind-muscle connection.
Who it's for
Lifters with noticeable chest asymmetry. Those wanting to improve fly mind-muscle connection. Anyone whose strong side dominates bilateral flyes.
Brace against the bench with your free hand to prevent rotation. All your attention goes to one pec—feel every fiber stretch and squeeze. Start with your weaker side while focus is fresh.
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Lie flat on a bench holding one dumbbell extended above your chest.
Hold the bench or place your free hand on your hip.
Lower the dumbbell out to the side in an arc with a slight elbow bend.
Go until you feel a deep stretch in your chest.
Bring the weight back up in the same arc pattern.
Complete all reps on one side then switch arms.
Brace your core to prevent rotation on the bench.
Focus intensely on the working side for mind-muscle connection.
Use lighter weight than bilateral flies due to stability demands.
Keep the same slight elbow bend throughout the movement.
Use single-arm flyes when bilateral flyes reveal one side working harder than the other. Place after standard flyes to address asymmetry. Lower weight than bilateral—the instability and focus make each rep harder.
Rotating the torso instead of keeping it stable.
During any pressing movement like the Single Arm Dumbbell Fly, this mistake reduces how effectively your Chest (pectoralis major) can produce force. Focus on the muscle you're trying to work — if you can't feel your Chest (pectoralis major) driving the movement, something is off.
Going too heavy and turning it into a pressing motion.
Loading more weight than you can control on the Single Arm Dumbbell Fly often creates compensations that shift work away from your Chest (pectoralis major). Reduce the load until each rep follows the intended path.
Not controlling the weight through full range of motion.
Cutting the range of motion short on the Single Arm Dumbbell Fly can reduce the training stimulus for your Chest (pectoralis major). Use the largest comfortable range you can control without changing the intended setup.
Changing the elbow angle during the movement arc.
Letting your elbows drift away from the intended path during the Single Arm Dumbbell Fly can change which muscles carry the load. Use the elbow position described in the setup cues and keep it consistent through each rep.
Lifters with noticeable chest asymmetry. Those wanting to improve fly mind-muscle connection. Anyone whose strong side dominates bilateral flyes.
These ranges illustrate ways to organize training. They are not an individual prescription. Adjust them for the exercise, your experience, and the rest of your program.
Heavier loads can be useful for developing maximum strength. The range shown is an example, and the load must match your current technique and capacity.
Muscle growth can occur across different loads and repetition ranges. This example is not a uniquely effective zone; your overall program and effort also matter.
This is an example of a longer set. A repetition target alone does not establish joint safety or whether the exercise is appropriate for you.
Example: 3 sets of 10-12 reps per arm. Rest 60s.
Background for resistance exercises: the 2026 ACSM position stand covers healthy adults, and a load-comparison review found similar muscle growth across loads in studies using sets taken to muscular failure. These findings do not validate every exercise-specific range shown here or require training to failure.
This is one example of how Single Arm Dumbbell Fly could sit inside a complete workout. Your plan may use different movements after Ely checks your assessment.
Sample workout
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Frequently Asked Questions About the Single Arm Dumbbell Fly
The Single Arm Dumbbell Fly primarily targets the Chest (pectoralis major), making it an effective exercise for chest development. Secondary muscles worked during the Single Arm Dumbbell Fly include Front shoulders (anterior deltoid), providing additional training stimulus. Stabilizer muscles engaged include Core, Biceps.
Our library labels Single Arm Dumbbell Fly as intermediate. That category is not an individual assessment. Review the setup, movement instructions, and safety notes, and seek qualified guidance if you are unsure how to perform it.
The programming section shows examples for Single Arm Dumbbell Fly. The appropriate amount depends on your current ability, the exercise, and your other training. The listed ranges are not an individual prescription or a guarantee of a particular outcome.
The main equipment listed for Single Arm Dumbbell Fly is a dumbbell. Check the instructions for any additional support, anchor, bench, rack, or clear space needed. The equipment label alone does not confirm that your home setup is suitable.
Good alternatives to the Single Arm Dumbbell Fly include: Dumbbell Fly, Cable Fly, One-Arm Cable Crossover. These exercises target similar muscle groups as the Single Arm Dumbbell Fly and can be used as substitutes based on your equipment availability, gym setup, or training preferences.