If you're an old-schooler like I am, DON'T SUPINATE YOUR WRISTS when doing curls (like Arnold). HORRIBLE on old shoulders. Yes, its the best way to curl. Yes, it's what Arnold did when he was young. Yes, I can GUARANTEE Arnold does NOT do it anymore at his age or for the last 20 years (at least). NO, you should not do it 1)if you are over 35 and/or 2) you have pre-existing shoulder issues.
Kick some ass...