Stronger

Rear Delt Fly Machine

Rear Delt Fly Machine demonstration

Category

isolation

Difficulty

beginner

Equipment

machine

Force Type

pull

How to Perform the Rear Delt Fly Machine

  1. Adjust the handles on the pec deck machine to the rear position and set the seat height so the handles are at shoulder level.
  2. Sit facing the machine with your chest pressed against the pad and grip the handles with a neutral or overhand grip.
  3. Start with your arms extended in front of you at shoulder height with a slight bend in your elbows.
  4. Pull the handles apart and back by squeezing your rear deltoids, moving your arms in a wide arc.
  5. Continue until your arms are in line with or slightly behind your shoulders, squeezing the rear delts at the peak contraction.
  6. Slowly return the handles to the starting position under control without letting the weight stack slam.
  7. Keep your chest pressed firmly against the pad and avoid arching your back throughout the movement.
  8. Repeat for the desired number of repetitions.

Common Mistakes to Avoid

Using the traps to pull the weight by shrugging the shoulders

Keep your shoulders depressed and focus on initiating the movement from the rear deltoids.

Pulling with the arms rather than the rear delts

Maintain a fixed elbow angle and think about driving your elbows back rather than pulling your hands.

Going too heavy and losing control

Use a moderate weight that allows a full range of motion and a squeeze at the back; rear delts respond best to higher reps.

Muscles Worked

Benefits

  • Effectively isolates the rear deltoids, which are difficult to target with compound movements alone.
  • Improves posture by strengthening the muscles that counteract forward shoulder rounding.
  • The machine provides a fixed path that makes it easy to maintain proper form even when fatigued.

Pro Tips

  • Use a neutral grip (palms facing each other) to maximize rear deltoid activation.
  • Hold the peak contraction for 1-2 seconds on each rep for better mind-muscle connection.
  • Perform rear delt work at the beginning of your shoulder workout to prioritize this often-lagging muscle group.

Variations

Recommended Sets & Reps

Strength

4-5 sets of 3-5 reps at 80-90% 1RM

Hypertrophy

3-4 sets of 8-12 reps at 65-75% 1RM

Endurance

2-3 sets of 15-20 reps at 50-60% 1RM

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