Quote:
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Muscle shape is a function of genetics and degree of overall development. As you develop a muscle towards its potential, it does change in appearance (generally for the better) but always within the parameters defined by its inherent shape. A person who tends to have proportionately more mass towards the upper, lower, inner or outer region of his or her pectoralis-major will always have that tendency, though it may be more or less apparent at various stages in their development, and in most cases appears less pronounced as overall development proceeds.
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This has been my experience with my own chest (and in genera). And while my chest may never be the exact shape I would like it to be as "the inherant shape" came out it did seem to be for the better.
Hell even my lats changed for the better when they really started growing and I can assure you that I have never planned my training to isolate the lower or upper lats or anything like that. Bigger muscle just look better no matter what the shape.