Flex wheeler sYs it helps to lengthen the bi I don't believe that bicep length is outlet genetics I have veery peaked bis and the go pretty far down but not as far down as say levrones who has little peak it's all genetic eg ronnie darren and even ronnie you can't change your muscle insertions
I thought he says it helped with the peak, but now that you bring it up, I agree with you. I know that when I focus on lowering it all the way down, I get a real burning sensation right where the bicep inserts at the elbow. As a matter of fact, after I finish that exercise, I dare not bend my arms, because I will get a cramp or a muscle spasm. It's always that exercise or doing a partial barbell curl (sitting with the barbell in my lap, and curl to halfway).
Levrone and Sergio had long full bicep insertions, yet relatively "poor" peak. I have more of that, my brother has very good peaks, insane. He doesn't like training, but if he stayed on it, he would be insane.
MuscleMcMannus, there is a vid of him training his "wife"...she's hitting the pads.
