Your chest or pectoral muscles are essentially your main source for upper body strength. They lend themselves to your arm and shoulder movement, rotation ability, and adduction and abduction. Your pectoral muscles are responsible for pressing, pushing, flapping, and waving motions.
A strong chest is one that can generate and exert force. A broad or wide chest can help you generate and exert that force as well as, improve your posture, promote better breathing/respiratory function, provide breast support, and lift, and make your overall frame more aesthetically appealing.
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