I want more or a "peak" on my biceps. Can certain exercises change the shape of muscles?
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When it comes to the shape of a particular body part, muscle, or muscle group, everything is not under your complete control. Your genetic disposition has the final say in the shape of a particular body part, muscle, or muscle group.
What you can control, however, is the amount of high-quality, dense muscle your genetic disposition has to work with. Your goal is to efficiently stimulate the muscle with good old fashioned weight training in order to maximize the amount of size and mass a particular body part carries.