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Cable Rear Delt Fly: How to Do It, Muscles Worked & Form Tips
The cable rear delt fly is an isolation exercise that targets the rear (posterior) deltoids — one of the most neglected muscles in the upper body. Because it uses cables instead of dumbbells, it keeps constant tension on the rear delts throughout the entire movement, making it one of the most effective exercises for building balanced shoulders, improving posture, and preventing injuries.
In this guide, you'll learn how to do the cable rear delt fly with perfect form, which muscles it works, the most common mistakes to avoid, and how to program it into your shoulder workouts.
Table of Contents
Cable Rear Delt Fly: Muscles Worked
The cable rear delt fly is a pulling isolation movement that focuses almost entirely on the back of the shoulder.
Muscle | Role |
Rear deltoid (posterior deltoid) | Primary — the main mover; extends the shoulder and pulls the arm backward |
Rhomboids | Secondary — retract the shoulder blades as you pull |
Trapezius (middle fibers) | Secondary — stabilize and control the scapula |
Infraspinatus & teres minor (rotator cuff) | Stabilizer — support the shoulder joint through the movement |
Lateral deltoid | Stabilizer — assists in the final range of motion |
Core (abs and obliques) | Stabilizer — keeps your torso still during the pull |
Key takeaway: the rear delt is often underdeveloped because most pressing exercises hit the front and side delts. The cable rear delt fly corrects that imbalance — and the constant tension of the cable means the muscle never gets a rest, even at the bottom of the rep.
How to Do the Cable Rear Delt Fly: Step by Step
Credits: Luke Hoffman
Set up the cables. Attach single handles (or stirrup handles) to two low-to-mid cable pulleys, set at about chest height. Stand in the center, one cable on each side.
Grab the opposite handles. Take the left handle in your right hand and the right handle in your left hand — your arms should cross in front of your body. Alternatively, grab each handle with the same-side hand for a parallel setup.
Set your stance. Stand with feet shoulder-width apart, knees slightly bent, and a slight hinge forward at the hips (about 15–30 degrees). Keep your chest up and your back flat.
Start with your arms extended in front of you, elbows slightly bent (not locked), palms facing each other or down.
Pull the handles out and back in a wide arc, squeezing your shoulder blades together as your arms travel toward the sides and slightly behind your body. Keep your elbows at a fixed, slight bend throughout.
Pause briefly at the peak contraction — you should feel the rear delts burning.
Return slowly and under control to the starting position, feeling the stretch in your rear delts. Don't let the weight stack drop.
Continue for the desired number of reps.
Breathing: exhale as you pull the handles back; inhale as you return.
Common Mistakes to Avoid
Credits: BullFit
❌ Shrugging your shoulders. Lifting your traps turns the fly into a shrug and steals tension from the rear delts. Keep your shoulders down and relaxed.
❌ Using momentum. Swinging your torso back and forth shifts the load away from the rear delts. The movement should come only from your arms and shoulder blades.
❌ Rounding your back. A hunched posture reduces rear delt activation and stresses the spine. Keep your chest proud and your back flat.
❌ Locking your elbows. Fully straight arms shift stress to the elbow joint and reduce rear delt isolation. Keep a slight, fixed bend.
❌ Going too heavy. The rear delt is a small muscle — heavy weight forces cheating. Use a moderate load you can control with perfect form.
❌ Hyperextending the wrists. Keep your wrists neutral to avoid strain and keep the tension on the delts, not the forearms.
Benefits of the Cable Rear Delt Fly
Builds balanced, rounded shoulders. Most shoulder work targets the front and side delts. The rear delt fly fills the gap, giving your shoulders a fuller, 3D look.
Constant tension for better growth. Unlike dumbbells, cables keep resistance on the muscle through the entire range of motion — including the bottom, where dumbbells are "dead."
Improves posture. Strong rear delts and rhomboids pull your shoulders back, counteracting the forward-rounded posture from sitting at a desk.
Prevents shoulder injuries. The rear delt and surrounding rotator cuff muscles support the shoulder joint. Strengthening them improves stability and reduces injury risk in pressing exercises.
Low risk, beginner-friendly. It's an isolation movement with a fixed cable path, making it safe and easy to learn.
Variations to Try
Single-arm cable rear delt fly — one arm at a time; lets you focus on each side and fix imbalances.
Cable rear delt crossover — the crossed-handle version (this guide's main setup); adds a greater stretch at the start.
Dumbbell rear delt fly — the classic version; great for a deep stretch, though tension drops at the top.
Rear delt fly machine (reverse pec deck) — a stable machine version that's very beginner-friendly.
Face pull — a related pulling exercise that hits the rear delts and upper back with a rope; excellent for posture.
Programming the Cable Rear Delt Fly
Sets & reps for hypertrophy: 3–4 sets of 12–20 reps. The rear delt responds well to higher reps with lighter loads.
Sets & reps for endurance: 2–3 sets of 20–30 reps as a finisher.
Frequency: 2–3 times per week, ideally on pull days or shoulder days.
Placement in the workout: rear delts are easy to neglect — do them early in your shoulder workout, before pressing, to ensure they get quality work. Or use them as a finisher at the end of a pull day.
Pro tip: hold the peak contraction for 1–2 seconds each rep to maximize the mind-muscle connection — rear delts respond strongly to tempo.
FAQ
What muscles does the cable rear delt fly work?
It primarily targets the rear (posterior) deltoids, with support from the rhomboids, middle traps, and rotator cuff muscles. It's an isolation exercise for the back of the shoulder.
Is the cable rear delt fly better than the dumbbell version?
For constant tension, yes — cables keep the muscle under load through the entire range of motion, while dumbbells lose tension at the top of the movement. Both are valuable; use both for variety.
How much weight should I use?
Start light. The rear delt is a small muscle that responds to controlled, higher-rep work. Use a weight you can perform 15+ reps with while keeping your torso still.
Why are my rear delts so weak?
Because pressing exercises (bench, overhead press) dominate most programs, the rear delts are often under-stimulated. Add rear delt isolation work 2–3 times per week — it will catch up quickly.
Can beginners do the cable rear delt fly?
Absolutely. The cable path is stable and the movement is simple to learn. Start with light weight and focus on form.
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