What Are Pectorals Good for?

In addition to your back and shoulder muscles, your pecs help to stabilize the shoulder joint. Better Breathing: In addition to improving your posture, strengthening and lengthening chest muscles helps to support deeper breathing. That's because the pecs are attached to your ribs, which expand with every breath.

What does the pectoral muscle help you do?

It runs from your shoulder blade to your rib cage. The pectoral muscles share a similar function: They help you adduct your arms, or bring them close together to the center of your body—say, like when you clap your hands or push your arms out in front of you with a chest press.

Are big pecs useful?

Strong pecs contribute to your overall upper body strength. They improve your ability to push things -- whether that's a heavy barbell, a couch or a stalled car. Pecs, along with your shoulders, are also intrinsic in throwing and swinging actions.