Do concentration curls help build a bicep peak, or is a high peak pretty much genetic? If it's genetic is there any reason to spend time on concentration curls, cable curls ect?
Genetics determines a lot of it, but I personally suspect that some individual trainers just aren’t doing what they need to in order to develop that portion of their fibers.
Lots of people will disagree with this, which is perfectly fine; it's only my opinion:
Just as some trainers have naturally good body parts that seem to grow & develop well for them with very little stimulation, other less fortunate individuals have to work a lot harder to realize even a fraction of the results.
I currently believe that this sometimes also applies to bicipital “peak.”
Some guys develop it through basic exercises.
Some guys develop it via special means
(specific exercises).
Yet, others are fukked no matter what they do.
Sorry.
If you currenlty are lacking biceps peak, then my recommendation is to try those exercises that “supposedly” build peak development.
If you have any “genetic potential” to develop a peak, that should help you realize it.
And, if you have “0” potential, then just work your ass off and develop what you can.
Chances are you can still grow pretty big arms.