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Originally Posted by
Darksyde
you cant change the origin or insertion point of your latissimus, you can just make the muscle bigger. so the answer is: mass.
[i do deviate from the current prevailing theory ('you cannot change the shape of a muscle, only make it bigger or smaller) a little bit, i believe seperate areas of muscle fibers can be stimulated differently (depending on how much they get to contract in relation to the rest of the muscle) if the angle of pull is consistently from one direction.]