To fully develop your biceps (especially for when somebody tells you to "make a muscle"), you need to work the peak contracted position.

And most people do Concentration Curls for this.

Newflash...normal form is, in my opinion, kind of useless.

I've got a better way.

Check it out here...

This is actually a change that is so simple that you'll wonder why you didn't think of it a long time ago (at least that's what I thought!).

So instead of coming across like usual, you're going to do this...

Nick Nilsson
The Mad Scientist of Muscle

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https://www.madscientistofmuscle.com/1-exercises/bicep-exercises/beside-the-head-concnetration-curls.htm
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