Single Arm Dumbbell Fly
Primary
Chest
Secondary
Shoulders, Core
Equipment
Dumbbell
Difficulty
Intermediate
Type
Push
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An isolation exercise that lets you focus on one muscle group, the Single Arm Dumbbell Fly targets your chest through a pushing movement pattern. Use for fixing muscle imbalances or improving mind-muscle connection.
Everything You Need to Know About the Single Arm Dumbbell Fly
The Single Arm Dumbbell Fly is a intermediate difficulty exercise that targets your Chest (pectoralis major). It's a popular choice for building strength and muscle in these areas. When should you use it? Use for fixing muscle imbalances or improving mind-muscle connection. This timing makes the most of your workout and helps you get better results. Who is this for? Intermediate lifters wanting to address chest asymmetries. Whether you're just starting out or working toward a specific goal, this exercise fits into your routine.
Single Arm Dumbbell Fly — targeted muscles
Primary
Secondary
Stabilizers
How do you perform the Single Arm Dumbbell Fly?
- 1
Lie flat on a bench holding one dumbbell extended above your chest.
- 2
Hold the bench or place your free hand on your hip.
- 3
Lower the dumbbell out to the side in an arc with a slight elbow bend.
- 4
Go until you feel a deep stretch in your chest.
- 5
Bring the weight back up in the same arc pattern.
- 6
Complete all reps on one side then switch arms.
What are the best tips for the Single Arm Dumbbell Fly?
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.
Common Single Arm Dumbbell Fly mistakes
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 forces compensatory movement patterns that bypass your Chest (pectoralis major). Drop the weight until you can perform every rep with clean form — your results will actually improve.
Not controlling the weight through full range of motion.
Cutting the range of motion short on the Single Arm Dumbbell Fly means your Chest (pectoralis major) never reaches full stretch or full contraction. Research shows full range of motion produces significantly more muscle growth than partial reps at the same load.
Changing the elbow angle during the movement arc.
Letting your elbows drift wide during the Single Arm Dumbbell Fly shifts load onto your shoulder joint instead of your Chest (pectoralis major). Keep them tucked at about 45 degrees to protect your rotator cuff and keep tension where it belongs.
Single Arm Dumbbell Fly — who it's best for
Intermediate lifters wanting to address chest asymmetries.
How to Program the Single Arm Dumbbell Fly
Lower reps with heavier weight builds raw strength. Your muscles and nervous system adapt to handle more load over time. This range is best for strength-focused goals.
This rep range keeps your muscles under tension long enough to trigger growth. Most people see the best muscle-building results in this zone. It balances strength and muscle size.
Higher reps with lighter weight builds muscular endurance and improves conditioning. This range is good for joint health and building work capacity.
General guideline: 3 sets of 10-12 reps per arm. Rest 60s.
What are good alternatives to the Single Arm Dumbbell Fly?
Dumbbell Fly
Cable Fly
One-Arm Cable Crossover
Other Variations
- Single Arm Incline Fly
- Single Arm Cable Fly
This Exercise Is in Your Plan
MySetPlan picks the right exercises for your goals — like the Single Arm Dumbbell Fly — and builds them into a monthly program. Every set, every rep, planned out.
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Safety Notes
- Use lighter weight than bilateral flies.
- Keep core engaged to prevent falling off the bench.