Is the pec deck better than the bench press?

Neither is strictly better, but they serve different purposes; the bench press is a compound move for overall strength, while the pec deck is an isolation tool for targeting the pectorals without taxing the triceps.

Should my arms be straight or bent?

You should maintain a slight, fixed bend in your elbows to reduce stress on the joint and focus the load on the chest fibers.

Why do I feel this more in my shoulders than my chest?

This usually happens if the seat is too low or your elbows are flared too high; ensure the handles are level with your mid-chest and keep your shoulder blades retracted.

Pec Deck Machine Guide: Isolation for a Stronger Chest

Learn the correct form for the pec deck machine to isolate your chest, improve muscle definition, and avoid common shoulder injuries.

How to Perform

Adjust the seat height so that the handles or pads are level with your mid-to-lower chest and your feet are flat on the floor.
Sit with your back and head firmly against the pad while maintaining a slight natural arch in your lower spine.
Grasp the handles with a neutral grip and position your elbows slightly below shoulder height to protect the rotator cuff.
Exhale as you squeeze the handles together in a controlled arc, focusing on moving the weight with your chest rather than your hands.
Pause for a full second at the peak of the contraction when the handles are closest together.
Inhale and slowly reverse the motion, returning to the starting position until you feel a comfortable stretch in your chest muscles.
Maintain a slight bend in your elbows throughout the entire set to keep the tension on the muscle belly.

Common Mistakes

Allowing the weight stack to touch between reps which removes tension from the muscles.
Banging the handles together at the center of the movement.
Arching the lower back excessively or lifting the hips off the seat to move the weight.
Letting the elbows travel too far back past the shoulders, increasing the risk of joint strain.

Muscles Worked

Primary movers

Pectorals

Stabilizers

Anterior Deltoids
Serratus Anterior

Related Guides

Pectorals · Chest