none, bicep peaks are genetical. Look at someone like Kevin Levrone, huge arms but no peak on his biceps. Ronnie Coleman and Markus Ruhl are monsters with genetics that display awesome bicep-peaks.
A muscle is like a guitarstring, the whole string either vibrates or does nothing. You can't hit a specific spot on your muscle fibers to get a bicep peak. You can still build monsterarms and the "peak" will look better as the arms get bigger.
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