Not fully stretching on the negative but fuck me, from now on I'm doing half reps to get biceps like that!
Definitely Goosey, it's been said many times, work the muscle not the weight and as you've said before, intensity of work which can't be quantified by a number.
I just started doing concentration curls and they are now my favourite bicep exercise.
Whats wrong with it - im pretty sure he starts curling his wrist near the top part of the movement
if it gave him those biceps then there is absolutely nothing wrong with it.
no google says its wrong
Agreed, I know a few bbers who used to squat heavy but have since learned to work the muscle more and now generally only squat between 100 and 140kg.