>>>1.) im not natural, 2.) i said 12 sets, three are warmups , so i only do 9 sets, Im not a gentic wonder like some guys, my biceps wont grow for shit with 4 sets.
Why do three warm-ups? Waste of time IMHO. I do biceps after I do chest (my overall body is warmed up and sweating good by then), and I do ONE set of warm-up curls before I do my straight bar curls, after that I do Preacher and then Curls using this hammer strength machine (much like standing dumbbell curls).
My recommendation, do lower volume, hit them harder and heavier, and do straight bar curls first with as much weight as you can for good form.
Here is my workout for reference:
warmup straight bar curl (10 reps)
Straight bar curl, 3 sets 10-8-6 reps, pyramid weight up
Preacher, 3 sets 10-8-6 reps, pyrmaid weight up (go to failure)
Standing curls (machine), 3 sets 10-8-6, pyramid weight up (go to failure)
That's 10 total, 9 without the warmup, and I think I'm on the high side, no gear, all natural