Exercise guide
Lever Side Seated Single Arm Rear Delt Fly
- Beginner
- Isolation
- Rep-based
- Shoulders
This unilateral isolation exercise targets the posterior deltoid and middle trapezius by utilizing a side-seated position to optimize the line of pull. It allows for a greater range of motion and better mind-muscle connection by focusing on one shoulder at a time.
Reviewed by the Crucible team · Updated June 2026
Muscles worked
Setup
- Place a flat bench perpendicular to the leverage machine and sit sideways so your non-working side is closest to the weight stack.
- Adjust the seat height or your position so the machine's handle is aligned with your shoulder height.
- Grasp the handle with your outer hand using a neutral or overhand grip, keeping a slight bend in your elbow.
- Plant your feet firmly on the floor and brace your core to stabilize your torso against the bench.
How to do it
- Exhale as you pull the lever back and outward in a wide arc until your arm is nearly in line with your torso.
- Lead the movement with your elbow, keeping your arm parallel to the floor throughout the entire range of motion.
- Inhale as you slowly return the handle to the starting position, stopping just before the weight stack touches to maintain tension.
- Maintain a controlled 2-1-2 tempo: two seconds to pull, a one-second squeeze at the top, and two seconds to return.
Form checklist
- Keep your torso stationary and avoid rotating your chest toward the machine during the pull.
- Maintain a fixed, slight bend in the elbow to ensure the rear delt is doing the work rather than the triceps.
- Keep your shoulder blade depressed and avoid shrugging the weight toward your ear.
- Ensure your wrist remains neutral and does not curl inward during the contraction.
Pro tips
- Think about pushing the handle 'away' toward the side wall rather than just pulling it back to maximize rear delt fiber recruitment.
- Use a thumbless 'suicide' grip to reduce forearm involvement and help you focus on leading with the elbow.
Make it harder
- Incorporate a 3-second isometric hold at the peak of the contraction to increase time under tension.
- Perform '1.5 reps' by pulling to the top, returning halfway, pulling back to the top, and then fully lowering.
Frequently asked
- What muscles does the lever side seated single arm rear delt fly work?
- The lever side seated single arm rear delt fly primarily targets the deltoids, and also works the rhomboids as secondary muscles.
- What equipment do you need for the lever side seated single arm rear delt fly?
- The lever side seated single arm rear delt fly uses leverage machine.
- Is the lever side seated single arm rear delt fly good for beginners?
- Yes. The lever side seated single arm rear delt fly is a beginner-friendly movement and a strong foundation to build on.
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