Exercise Guide
How to do machine seated reverse fly
Master the setup, range of motion, and tempo for safer, more effective reps.
Overview
Most people focus on the muscles they can see in the mirror, leading to overdeveloped chests and weak rear shoulders. The Seated Reverse Fly (or Reverse Pec Deck) fixes this imbalance.
By sitting facing the machine and pulling your arms backward, you isolate the rear deltoids and the muscles between your shoulder blades. This is essential for shoulder health, as it pulls your shoulders back into a neutral position and balances out all the 'pushing' we do in daily life.
Why Use It
- Isolates the rear deltoids (back of the shoulder) perfectly.
- Improves posture by strengthening the upper back muscles.
- Helps prevent shoulder injuries by balancing out chest training.
When to Use It
This is a perfect 'accessory' move for your pull days or shoulder days. Use it after your heavy rows or overhead presses to hit the smaller muscles of the shoulder.
Instructions for Proper Form
Setup
- The Seat: Adjust the seat so that when you grab the handles, your arms are parallel to the floor.
- The Chest Pad: Sit facing the machine. Press your chest firmly against the pad—this is your anchor.
- The Grip: Grasp the handles. You can use a palms-down or palms-in grip depending on what feels most comfortable for your shoulders.
Execution
- The Pull: Exhale and pull the handles back in a wide arc. Focus on moving your elbows back, not just your hands.
- The Pinch: At the end of the movement, pinch your shoulder blades together for a split second.
- The Return: Slowly bring the handles back to the starting position. Don't let the weight stack slam.
Trainer Tip: Imagine you are trying to push the back of your hands against the walls on either side of you. This helps keep the focus on the shoulders rather than the arms.
Common Mistakes
- Shrugging: Using your traps to pull the weight up toward your ears.
- Chest Lifting: Pulling your chest off the pad to use momentum.
- Wrist Bending: Curling your wrists to try and get more range of motion.
Mistakes by Level
Beginner
- Pulling with the biceps instead of the shoulders.
- Moving too fast.
Intermediate
- Not getting a full squeeze at the back.
- Letting the shoulders round forward during the return.
Advanced
- Using too much weight and losing the isolation of the rear delt.
- Failing to control the eccentric (forward) phase.
Mechanics
Use these setup and execution anchors to keep the rep organized, repeatable, and easier to progress.
Movement Pattern
Horizontal Pull
Body Position
Seated
Load Style
Machine Guided
Muscles Worked
Primary
- Rear-shoulders
Secondary
- Traps
- Rhomboids
Stabilizers
- Core
Setup Requirements
- Adjust the seat height so the handles are at shoulder level.
- Sit facing the machine with your chest firmly against the pad.
- Adjust the arm levers so they are all the way forward.
Form Checklist
- Is your chest staying on the pad?
- Are you leading with your elbows rather than your hands?
- Are you avoiding shrugging your shoulders up?
- Are your wrists staying neutral?
Range of Motion
Start with your arms in front of you. Pull them back in a wide arc until they are in line with your torso. Don't pull so far back that your back arches.
Breathing Pattern
Exhale as you pull the handles back; inhale as you slowly bring them back together.
Tempo Guidance
1 second to pull back, 1 second squeeze, 2 seconds to return to the start.
Caution Notes
- Keep the weight light. The rear delt is a small muscle, and using too much weight will cause your bigger back muscles to take over.
Programming
Treat these guidelines as practical programming defaults, then scale load, volume, and frequency to match the rest of the training week.
Best For
- Correcting 'rounded shoulders' posture.
- Building shoulder width and thickness.
- Improving shoulder stability for heavy lifting.
Goal Tags
Rep Ranges
- 12-15 reps for muscle growth and endurance.
- 15-20 reps for a focused pump.
- 10-12 reps for strength.
Set Guidance
3 sets. High reps and short rests work best for this muscle group.
Rest Guidance
45-60 seconds.
Frequency
Can be done 2-3 times per week.
Pairings
- Pair with face pulls for ultimate rear-shoulder development.
- Superset with side lateral raises for a complete shoulder burnout.
Audience Notes
- Beginners should focus on 'feeling' the back of their shoulder work.
- Advanced lifters can use a 'neutral' grip (palms facing each other) to change the emphasis slightly.
Substitution Targets
- Dumbbell rear delt fly.
- Face pulls.
- Band pull-aparts.
Variations
Use progressions to increase difficulty when you master the movement, and regressions if you struggle with proper form or face mobility limitations.
Regressions
Band Pull-Aparts
Uses a light resistance band to practice the movement with zero joint stress.
Best for: Warm-ups or absolute beginners.
Progressions
Dumbbell Rear Delt Fly
Requires much more core stability and control of the weight path.
Best for: Intermediate lifters.
FAQ
Common Questions
Should my arms be straight?
Keep a very slight bend in your elbows to protect the joint, but don't let that bend change during the rep.
Why do I feel this in my neck?
You are likely shrugging your shoulders. Focus on keeping your shoulders 'down' and away from your ears.
Alternatives
Start with the closest related options, then browse fallback alternatives that keep the same primary training focus.