You can't shape your muscle, which is basically what you're asking.
Unfortunately, that's a myth. There's no "upper/lower chest, upper/lower abs." it's all one muscle and it is used as one. You can't put more stress on one part of the muscle and hope that that part will grow. It doesn't work that way.
Unfortunately, that's a myth. There's no "upper/lower chest, upper/lower abs." it's all one muscle and it is used as one. You can't put more stress on one part of the muscle and hope that that part will grow. It doesn't work that way.

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