How to do the Pec Deck
Primary: Chest · also works Front Delts. Also called: machine chest fly, butterfly machine.
Step by step
- 1
Adjust the seat so the handles are level with the middle of your chest.
- 2
Sit with your back flat against the pad and grab the handles with a slight bend in your elbows.
- 3
Bring the handles together in front of your chest in a smooth arc.
- 4
Squeeze at the front, then return slowly until you feel a stretch.
Coaching cues
- Keep your chest up and shoulders back
- Lead with your elbows, not your hands
- Do not let the weight stack touch between reps
Common mistakes
- Setting the starting range too far back for the shoulders
- Jerking the handles together
- Rounding the shoulders forward
Sets, reps and where it fits
Muscle
3–4 × 10–15
rest 60–90 s
Strength
not a strength lift
use for assistance
Fat loss
3 × 10–15
rest 45–60 s
Pec Deck alternatives
Same movement pattern, different equipment or difficulty. Swap one-for-one in any plan.
Frequently asked questions
What muscles does the Pec Deck work?
Primary: Chest. Secondary: Chest, Front Delts
How many sets and reps of Pec Deck should I do?
For muscle: 3–4 sets of 10–15 reps. For strength on compound lifts: 4–5 sets of 4–6. Rest 60–120 seconds between sets.
What can I do instead of the Pec Deck?
Same movement pattern, different equipment: Cable Chest Fly, Dumbbell Fly, Machine Chest Press, Push-Up, Machine Pec Deck Fly, Smith Machine Bench Press.
Is the Pec Deck good for beginners?
Yes. It is a beginner-friendly movement; start light, master the steps above and add load gradually.