The pec fly is a popular chest isolation exercise that targets the muscles of the upper chest, particularly the clavicular portion of the pectoralis major. By bringing the arms together in a controlled arc, the moment allows you to train the chest through a large range of motion whole maintaining consistent tension.
Pec flys are commonly performed using dumbbells with an adjustable bench, or a cable machine such as a Dual Adjustable Pulley or Seated Dual Cable, although specialist machines such as the Watson Arched Incline Pec Fly provide a guided movement pattern and adjustable resistance. The arched backrest helps position the torso for the movement, while the independent arms allow each side of the chest to work independently. This makes the exercise suitable for a wide range of users, from beginners learning to isolate the chest to experienced lifters looking to add targeted upper-chest volume.
You can also perform a seated pec fly using the Watson SS Pec Fly / Rear Delt, or for standing pec fly variations, using the Watson SS Multi Pec / Delt machine.
The Watson Arched Incline Pec Fly primarily targets:
Secondary muscles involved include:
Because the exercise is performed with the arms moving through an arc, rather than pressing the weight away from the body, the chest muscles remain under tension throughout the movement.
Targets the upper chest – The inclined position places greater emphasis on the upper portion of the pectoral muscles, making the exercise a useful addition to chest-focused training programmes.
Chest isolation – Unlike compound pressing movements, the pec fly reduces the contribution of the triceps, allowing you to focus more directly on the chest muscles.
Consistent resistance – The machine provides controlled resistance throughout the movement, helping maintain tension as the arms move together and apart.
Independent arm movement – Iso-lateral machines or dumbbell flys allow each arm to move independently, helping to encourage balanced development and allowing each side of the chest to work through its own natural movement.
Adjustable position – The adjustable seat position and selected range of motion allow for Pec Fly machines to be set up to suit different users, helping every user find a comfortable and effective training position.
Beginner friendly – The guided movement pattern of a machine makes the exercise easier to learn than free-weight alternatives, allowing beginners to focus on chest contractions and controlled movements.
PLATE LOADED VARIATION
Step 1 – Adjust the seat so that your back and shoulders are positioned comfortably against the machine with the handles at an appropriate starting position, level with your mid-chest.
Step 2 – Adjust the handles by rotating them to an appropriate depth of motion.
Step 3 – Select an appropriate weight and sit with your back firmly supported. Grip the handles and brace your core while keeping your chest lifted.
Step 4 – Bring the handles together by squeezing your chest muscles. Keep the movement controlled and avoid using momentum.
Step 5 – Pause briefly when your hands come together and contract your chest before slowly returning to the starting position.
Avoid allowing the weight to pull your arms back quickly at the end of the repetition.
SEATED SELECTORISED VARIATION
Step 1 – Adjust the seat so that your back and shoulders are positioned comfortably against the machine with the handles at an appropriate starting position, level with your mid-chest.
Step 2 – Select an appropriate weight and sit with your back firmly supported. Grip the handles and brace your core while keeping your chest lifted.
Step 3 – Open your arms under control until you feel a comfortable stretch across the chest.
Step 4 – Bring the handles together by squeezing your chest muscles. Keep the movement controlled and avoid using momentum.
Step 5 – Pause briefly when your hands come together and contract your chest before slowly returning to the starting position.
Avoid allowing the weight to pull your arms back quickly at the end of the repetition.
Using too much weight – A pec fly is an isolation exercise, so excessive weight can make it difficult to maintain control. Choose a resistance that allows you to complete every repetition with good technique.
Using momentum – Avoid swinging the arms or bouncing through the movement. A slow, controlled tempo keeps the chest working and reduces unnecessary movements.
Shrugging the shoulders – Keep your shoulders relaxed and avoid allowing them to rise towards your ears. Focus on moving the shoulder joints while maintaining a stable torso.
Shortening the range of motion – Don’t rush through partial repetitions. Use a comfortable range of motion that allows you to achieve a controlled stretch and strong contraction.
Overstretching – Although the chest should be stretched at the start of each repetition, avoid forcing the arms excessively far behind the body. Your range of motion should remain comfortable and controlled.
The Pec Fly is a chest isolation movement, so if your gym does not have an Pec Fly station, you could try Dumbbell Flys or Cable Flys. For a pressing-based alternative, you could also use Dumbbell Bench Press or Incline Dumbbell Press. Resistance Band Flys can be another useful option when other equipment is unavailable.
Chris Emmett
Watson Sales Representative, Certified Personal Trainer & Nutritionist
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Master the Pec Fly with our training guide exploring the benefits, mechanics, and common mistakes for this chest exercise.
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