Machine Pec Fly
A seated fly machine that isolates the pecs through an arc of motion — the cleanest chest-only stimulus in the gym.
How to do it
- Adjust the seat so the handles are at chest height and your elbows are roughly in line with your shoulders.
- Grab both handles with your elbows slightly bent and press your back firmly into the pad.
- Brace your core and pull your shoulder blades back and down to set a stable chest position.
- Bring the handles together in a wide arc, squeezing your chest and keeping a fixed elbow angle.
- Pause in the middle as the handles meet, holding a hard chest squeeze for a full count.
- Let the handles open slowly over 2–3 seconds until you feel a controlled stretch in your chest.
Key technique cue
Shoulder blades back and down, elbow angle fixed; don't roll the shoulders forward.
Common mistakes
- ✕ Bending the elbows mid-rep, which turns the movement into a press and loses chest isolation.
- ✕ Letting the shoulders roll forward in the stretched position, which loads the front delts.
- ✕ Swinging the handles together with momentum instead of squeezing them through the contraction.
- ✕ Cutting the stretch short and never opening the arms fully, which trains a tiny part of the movement.
Benefits
- ✓ Isolates the chest more directly than any pressing movement.
- ✓ Builds chest size with low joint stress and a strong mind-muscle connection.
- ✓ Easy to load progressively without overloading the shoulders or wrists.
Progression: from easier to harder
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Step 1 You are here - Machine Pec Fly
- Cable High-to-Low Fly
- Cable Pec Fly
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Step 2 -
Step 3
About the exercise
The Machine Pec Fly isolates the chest while taking the triceps and shoulders almost entirely out of the equation. Sitting upright with the arms locked into a pair of pads or handles, the lifter brings the arms together in a wide arc, loading the chest through its full adduction range. The fixed path makes the chest contraction unmistakable. It is a valuable accessory for chest day, hypertrophy work and finisher work after pressing. It also helps beginners who struggle to feel their chest working in the bench press.
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