Pec Deck
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The Pec Deck is a machine-based chest exercise performed seated in a pec deck (butterfly) machine, where you press your forearms or hands against the machine's arm pads and bring them together in a hugging motion to isolate the pectoralis major. Its primary purpose is targeted chest hypertrophy with a fixed, joint-friendly path that limits shoulder strain compared to free weights. It mainly targets the chest, with the front shoulders assisting secondarily, making it ideal for beginners and intermediate lifters who want controlled chest isolation. It requires a pec deck machine.
How to Perform Pec Deck
- 1Adjust the pec deck machine's seat height so the arm pads (or handles) line up with your shoulders, and select your weight on the stack.
- 2Sit back firmly against the pad with your feet flat on the floor, and place your forearms against the arm pads (or grip the handles) with elbows bent around 90 degrees.
- 3Engage your core and keep your back pressed into the seat pad throughout the movement.
- 4Exhale as you squeeze your chest to press the arm pads together in front of you, pausing briefly at full contraction.
- 5Inhale as you slowly let the pads return to the starting position, allowing a controlled stretch across your chest without letting the weight stack slam down.
- 6Repeat for desired reps, keeping the motion smooth and controlled throughout.
- 7Key form tips: Keep your shoulders down and back against the pad, and drive the movement from your chest rather than your shoulders. Common mistakes: Arching off the seat pad, using momentum to swing the pads together, or letting elbows drop too low.