Shoulders
Rear Delt Fly Machine
A precise isolation movement designed to build structural integrity and definition in the posterior deltoids.
How to perform.
Follow the sequence — setup is half the lift.
Adjust the seat height so that the handles are positioned directly at shoulder level when seated.
Place your chest firmly against the vertical pad and grab the handles with a neutral or overhand grip.
Maintain a slight bend in your elbows and pull the handles back in a wide arc until your arms are in line with your shoulders.
Squeeze your rear deltoids at the peak of the movement without shrugging your shoulders upward.
Control the weight as you return the handles to the starting position, maintaining tension throughout the entire rep.
Stop the return movement just before the weight plates touch to keep the muscle under constant load.
Common mistakes.
Fix these first — they cost reps, kilos, and joints.
- Using momentum or swinging the torso to move the weight.
- Shrugging the shoulders toward the ears, which shifts focus to the upper traps.
- Bending the elbows excessively, turning the movement into a rowing exercise.
- Locking out the elbows, which places unnecessary stress on the joints.
Muscles worked.
The primary movers do the work; the stabilizers keep the path honest.