I agree but what I am saying is that there is simply no inner chest. You can't grow solely the part of a pec that connects there. The entire muscle must grow. It cannot be reshaped or altered in any other fashion by resistence training. You might have felt cable crossovers helped your inner chest, but beyond pumping some blood into your pecs for temporary enlargement and doing a fairly dismal job at stimulating growth the effect upon the inner chest is placebo because it defies what are basically 100% proven facts in basic anatomy and physiology.
Take a look at the first picture on this page. You will see how the fibers of the pectoral stretch accross the chest. You cannot simply train the point of insertion at the center. You can activate more/less fibers with different exercises or weights but those fibers stretch laterally and there is no way to activate part of a fiber. How good/bad it looks on someone is defined primarily be genetics, body fat levels, and the size of the muscle. The genetic determinent is unchangable. It's how your muscle is attached to your sternum. If he has low body fat and it appears flat and unimpressive, he can only grow the muscle - not grow a portion of each of the laterial fibers attaching to the sternum in isolation to improve how his 'middle chest' looks.
http://education.yahoo.com/reference/gray/subjects/subject?id=122
EDIT: Also, there's no shame in not knowing this. While it is fairly basic stuff, I'd venture the majority of BBers, personal trainers, and gymrats don't realize this.
Take a look at the first picture on this page. You will see how the fibers of the pectoral stretch accross the chest. You cannot simply train the point of insertion at the center. You can activate more/less fibers with different exercises or weights but those fibers stretch laterally and there is no way to activate part of a fiber. How good/bad it looks on someone is defined primarily be genetics, body fat levels, and the size of the muscle. The genetic determinent is unchangable. It's how your muscle is attached to your sternum. If he has low body fat and it appears flat and unimpressive, he can only grow the muscle - not grow a portion of each of the laterial fibers attaching to the sternum in isolation to improve how his 'middle chest' looks.
http://education.yahoo.com/reference/gray/subjects/subject?id=122
EDIT: Also, there's no shame in not knowing this. While it is fairly basic stuff, I'd venture the majority of BBers, personal trainers, and gymrats don't realize this.
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