Exercise guide
Seated Pec Dec On A Chair
- Beginner
- Isolation
- Rep-based
- Chest
This isolation exercise mimics the pec deck machine to target the pectoralis major using self-resistance and isometric tension. It is ideal for improving mind-muscle connection and chest activation without the need for heavy equipment.
Reviewed by the Crucible Fit team · Updated June 2026
Muscles worked
Setup
- Sit upright on a chair or flat bench with your feet planted firmly on the floor.
- Retract your shoulder blades and lift your chest high.
- Raise your arms to the sides with elbows bent at 90 degrees, keeping your upper arms parallel to the floor.
How to do it
- Exhale as you slowly bring your forearms and elbows together in front of your chest until they touch.
- Squeeze your pectoral muscles as hard as possible at the point of maximum contraction for two seconds.
- Inhale as you slowly return your arms to the starting position, feeling a deep stretch across the chest.
- Maintain a controlled tempo, taking two seconds for both the closing and opening phases.
Form checklist
- Keep your elbows at shoulder height; do not let them drop as you fatigue.
- Maintain a proud chest and avoid rounding your shoulders forward.
- Ensure your back remains in contact with the chair or stays perfectly upright.
- Focus on driving the movement through the elbows rather than just the hands.
Pro tips
- Visualize trying to crush a grape between your pectoral muscles at the center of the movement.
- Create your own resistance by consciously tensing the chest muscles throughout the entire range of motion to maximize fiber recruitment.
Make it harder
- Perform the movement with a 5-second isometric hold at the center of every rep.
- Pulse the arms in the middle two inches of the range of motion for 15-20 reps immediately after a full set.
Frequently asked
- What muscles does the seated pec dec on a chair work?
- The seated pec dec on a chair primarily targets the pectorals, and also works the abs, deltoids, and triceps as secondary muscles.
- What equipment do you need for the seated pec dec on a chair?
- The seated pec dec on a chair requires no equipment — just your body weight.
- Is the seated pec dec on a chair good for beginners?
- Yes. The seated pec dec on a chair is a beginner-friendly movement and a strong foundation to build on.