Clearly, you're being sarcastic, but before I answer your question I should first point out that recent research now disproves the old theory that says if
a muscle fiber contracts, it contracts equally and fully along it's entire length.
This was a pretty big revelation in the bodybuilding world about 5 years ago because it proved that a muscle's ultimate shape was not pre-determined, but that we could actually change its shape by targeting different sections of a muscle's fibers along their length.
Previously, the idea that we could change a muscle's shape by stressing particular sections of fibers was largely rejected by mainstream science. The long-held belief stated that a muscle's shape was genetically pre-determined...and that its ultimate appearance was going to be whatever it was going to be, regardless of which exercises were performed, or how they were performed.
Of course, this theory was rejected by most bodybuilders...and now we know we were correct all along.
If we apply this to the lats, it means that we can target the "inner" lats to a greater degree than the "outer" lats by employing different exercises and mechanics.
Remember, I am NOT talking about changing a muscle's shape by working different fibers, but by stressing different sections of individual fibers. The difference is simple to understand. I will use the chest as an example. As you well know, we can preferentially target the upper chest by performing presses or flyes on an incline, as this tends to place more stress on the upper fibers of the chest compared to the lower fibers. Of course, this will allow us to change the chest's shape by altering the ratio of upper to lower chest mass, but it is a VERY different thing to be able to selectively add muscle to certain sections of particular fibers...such as the "outer-upper pec fibers" or the "inner-upper pec fibers".
Because chest muscle fibers run horizontally across the chest, working the inner or out chest fibers along the same plane requires one to stress the different upper-chest fibers at various points along their length. Therefore, it is possible to add mass selectively to the inner or outer chest.
As a coach, I assumed you knew which back exercises best target this area...and how to perform them...in order to selectively build the "belly", or inner-lower lats (which actually comprises the bulk of the lat muscles). But...if you're not sure you could always hire me.
I had it mostly figured out by age 22.
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