The single-arm low to high cable fly is a cable isolation exercise performed one arm at a time, sweeping the handle from beside the hip up and across the body to train the upper chest. The low pulley pulls the arm down and back, so the upper chest fibres that lift the arm up and across do the work, which a flat fly barely reaches. Working one arm lets the hand cross the midline, and the trunk has to resist the twist the single cable applies. Lifters program it as a late chest accessory after the incline pressing.
What Muscles Does the Single-Arm Low to High Cable Fly Work?
- Primary: Pectoralis major, clavicular head (upper chest)
- Secondary: Anterior deltoid, biceps brachii short head, serratus anterior
- Tertiary: External obliques, transverse abdominis, forearm flexors (grip)
How Do You Set Up for the Single-Arm Low to High Cable Fly?
Set one pulley to its lowest position and attach a single D-handle. Take the handle in the hand furthest from the stack, palm facing forward, and step out until the cable is taut with the arm down and slightly behind the hip. Stand in a split stance with the foot on the working side back, knees soft, torso upright, and the free hand on the hip. Pull the working shoulder down and back.
How Do You Perform the Single-Arm Low to High Cable Fly?
- Set a soft elbow bend and hold it fixed so the shoulder does the moving.
- Sweep the handle up and across the body in one arc, the hand travelling from beside the hip toward the opposite shoulder.
- Finish with the hand at eye height just past the midline, the elbow still soft and the shoulder down.
- Squeeze the upper chest for one count, keeping the hips and shoulders square to the front.
- Lower along the same arc over two counts until the arm is back beside the hip with the chest stretched.
- Reset the shoulder blade down and back before the next rep, and switch sides after the set.
What Are the Key Form Cues?
- Lead with the pinky: turning the little finger up as the hand rises keeps the upper chest, not the front delt, driving the arc.
- Keep the shoulder blade pinned: the shoulder stays down and back through the whole sweep; only the arm rises.
- Feel the stretch across the upper chest at the bottom before each rep begins.
- Brace the obliques on the free side so the torso does not rotate toward the stack.
- Think of the hand drawing a diagonal line from the hip to the opposite eye.
What Are the Most Common Mistakes?
- Loading the stack so heavy the torso twists to start the pull: the obliques do the work and the chest only finishes, so drop the weight until the shoulders stay square.
- Shrugging the shoulder up as the hand rises: the front delt and upper traps take over from the upper chest, so pull the shoulder down before the sweep.
- Bending the elbow to shorten the lever: the fly turns into a curl and press, so keep the elbow angle fixed.
- Stopping the hand at the midline: the last part of the arc, where the upper chest shortens most, is skipped, so finish past centre.
- Standing square to the stack: the cable pulls the arm sideways instead of down and back, so open the stance until the line of pull runs from the hip.
What Are the Best Single-Arm Low to High Cable Fly Variations?
- Cable crossover low to high: both arms at once, the standard version with less trunk demand.
- Single arm cable crossover: the pulley at shoulder height, shifting the emphasis to the mid chest.
- High to low single-arm cable fly: the pulley set high and the hand sweeping down, loading the lower chest.
- Kneeling single-arm low to high cable fly: kneeling removes the leg drive and forces the trunk to hold the line.
- Incline dumbbell fly: the same upper-chest line with a dumbbell on an incline bench, tension fading at the top.
How Do You Progress the Single-Arm Low to High Cable Fly?
- Add one plate on the stack once you complete all sets at 15 reps a side with the shoulders square throughout.
- Build from 10 reps a side up to 15 before the next plate.
- Add a set at a time up to 4 sets a side, starting with the weaker arm.
- Add a two-count squeeze at the top and a three-count lower when the next plate is too heavy to control.
How Should You Program the Single-Arm Low to High Cable Fly?
Place the single-arm low to high cable fly late in a chest session, after the incline press and any two-arm fly. Train it 1 to 2 times per week for 3 to 4 sets of 10 to 15 reps a side, resting 45 to 60 seconds between sets. Pair it with an incline dumbbell press so the upper chest gets both a heavy pattern and a stretch-loaded one.
