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When the muscle contracts the entire muscle contracts. There is no way to target one part of the muscle. Think of it like this: If you are stretching a rubber band and you can only hold it at two points, there is no way to stretch it any more at one place between those two points than at any other place between those two points. It is a common misconception that you can target a specific area of a single muscle. The shape the chest takes as it grows is determined by genetics.
I second doing dips though. They will kill your chest.
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