Single-Arm Cable Fly
- Intermediate
- Cable
The single-arm cable fly keeps the elbow softly bent and sweeps one hand across the body to the midline. The pectoralis major of the working side does the adduction, with the front deltoid and triceps assisting, and the unilateral setup adds an anti-rotation demand: EMG comparison of unilateral against bilateral pressing found substantially higher rectus abdominis and external oblique activity.
Working one side at a time also allows a longer adduction range than a bilateral fly. The cost is trunk control, so the stance stays staggered and the load stays light.
How to do the Single-Arm Cable Fly
- Set one pulley to roughly shoulder height and select a light load.
- Take the handle in the hand furthest from the stack and step out until the cable is taut.
- Move into a staggered stance with the outside foot forward and brace your abdominals.
- Keep a soft bend in the working elbow and sweep the hand across your body to the midline.
- Hold the contraction briefly without letting your torso rotate toward the pulley.
- Let the arm travel back out under control until the chest lengthens, then repeat and switch sides.
Muscles worked
- Primary:
- Chest
- Secondary:
- Shoulders, Triceps, and Core
Why train it
- Lets the hand reach the midline, giving a longer chest adduction range than a two-arm fly.
- Trains one side at a time, which exposes and addresses side-to-side differences.
- Recruits the abdominal wall to resist rotation while the chest does the pressing work.
Common mistakes
- Letting the torso rotate toward the stack turns the exercise into a twist and takes tension off the chest.
- Straightening and bending the elbow makes it a one-arm press, moving the work to the triceps.
- Standing square with a narrow stance leaves no base, so the load pulls the hips out of position.
- Overloading the working side forces the shoulder to finish the rep and shortens the adduction range.
Frequently asked questions
What muscles does the Single-Arm Cable Fly work?
The Single-Arm Cable Fly trains the chest as the main target. Expect the shoulders, triceps, and core to take some of the load as well.
What equipment do I need for the Single-Arm Cable Fly?
Only a cable machine. Nothing beyond that is required to run the movement the way it is described above.
Is the Single-Arm Cable Fly suitable for beginners?
With some training behind you. The Single-Arm Cable Fly is rated intermediate, which means the setup matters as much as the effort. It is a reasonable first month goal rather than a first session one, and the alternatives below are the easier way in.
Can I do the Single-Arm Cable Fly at home?
Only if your home setup runs to a cable machine. Most do not, so this is usually a gym movement. The alternatives below cover the same muscles with kit you are more likely to have.
How many sets and reps of the Single-Arm Cable Fly should I do?
Three to four sets of 10 to 15 reps. Isolation work responds to reps and a controlled tempo rather than load, so stop each set a rep or two short of failure and keep the weight honest.
What are good alternatives to the Single-Arm Cable Fly?
Barbell Bench Press, Bodyweight Elevated Push Up, and Decline Machine Chest Press train the same primary muscles as the Single-Arm Cable Fly. Pick whichever one matches the equipment in front of you.