Re: Bicep peak question
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Preachers have been mentioned as good for peak, but look at Larry Scott's biceps, they are extremely full, but don't have great peak and he practically made the preacher curl famous.
I would have to say genetics is the main factor.
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I thought preacher curls worked the bicep most when it is extended, not peaked. IMO the best for peak are ones that have a lot of force pulling against your muscle when it is at full contraction, i.e. the machines, or doing curls on an incline bench.