Pec Deck
The Pec Deck primarily works the Pectoralis Major (Clavicular), Pectoralis Major (Sternal), with secondary activation of the Anterior Deltoid, Serratus Anterior and stabilizer support from the Pectoralis Minor. It is a machine isolation exercise at beginner difficulty.
The Pec Deck is an beginner isolation exercise performed with machine, following a horizontal push movement pattern. It primarily targets the Pectoralis Major (Clavicular), Pectoralis Major (Sternal), with secondary engagement of the Anterior Deltoid, Serratus Anterior. This is a bilateral pushing movement, meaning both sides work together to generate force.
Machine-based chest fly with arms on lever pads providing constant tension.
| Equipment | Machine |
|---|---|
| Difficulty | Beginner |
| Type | Isolation |
| Movement | Horizontal Push |
| Force | Push |
| Laterality | Bilateral |
| Primary | Pectoralis Major (Clavicular), Pectoralis Major (Sternal) |
| Secondary | Anterior Deltoid, Serratus Anterior |
Muscles Worked
The Pectoralis Major (Clavicular), and Pectoralis Major (Sternal) are the primary movers, collectively driving the movement and absorbing the greatest share of the load. The Anterior Deltoid, and Serratus Anterior act as secondary movers, assisting the primary muscles and contributing meaningfully to the overall output. The Pectoralis Minor act as stabilizers, maintaining joint position and postural alignment throughout the movement.
Primary Muscles
- Primary Muscle Pectoralis Major (Clavicular) (chest)
- Primary Muscle Pectoralis Major (Sternal) (chest)
Secondary Muscles
- Secondary Muscle Anterior Deltoid (shoulders)
- Secondary Muscle Serratus Anterior (chest)
Stabilizer Muscles
- Stabilizer Muscle Pectoralis Minor (chest)
How to Perform
Preparation
- Adjust machine seat and pads to fit body.
- Sit or position body in machine.
Execution
- Press weight forward and away from chest until arms are extended.
- Return to starting position under control.
- Repeat.
Comments
- Maintain control throughout movement to fully engage the Pectoralis Major (Sternal), Pectoralis Major (Clavicular).
Tips & Common Mistakes
- Brace your core and keep your feet flat for a stable base throughout the movement.
- Control the descent — don't let the weight drop or bounce at the bottom.
- Keep your elbows at roughly 45–75° from your torso to protect your shoulder joints.
Programming Suggestions
Adapt your sets and reps to your training goal. As a beginner-friendly exercise, start with lighter loads and focus on form before progressing weight.
| Strength | 3–4 sets × 6–8 reps at 75–85% 1RM with 90–120 seconds rest. |
|---|---|
| Hypertrophy | 3–4 sets × 10–15 reps at 60–75% 1RM with 60–90 seconds rest. |
| Endurance | 2–3 sets × 15–25 reps at 40–60% 1RM with 30–45 seconds rest. |
Alternative Exercises
These exercises target the same primary muscles (Pectoralis Major (Clavicular), Pectoralis Major (Sternal)) and can be substituted based on your equipment or variation preferences.
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