Good video. I never thought I'd see the day when Rip would film a video for the gunz.
I still find the logic about the EZ curl bar strange, though. This was Mike Mentzer's argument regarding the relative superiority of the straight bar. And he drank his own pee, so that's never a good ally to have. Thoughts:
* The biceps is biarticulate, i.e. crosses both the shoulder and elbow, much like the triceps. As such, the fully contracted position (forearm supination + elbow flexion + shoulder flexion) represents a position of active insufficiency. I.e. the highest recruitment of motor units is not actually at the top of the movement, it's somewhere in the midrange, which you get just fine with an EZ curl bar.
* Besides missing a handful of degrees of supination, potential range of motion is otherwise identical.
* At the bro level, most bodybuilders that I've seen seem to prefer the EZ curl bar, and they're not exactly lacking in biceps function or size.
* I've always used the EZ curl bar as my primary form of curling, and the strength gained in it transferred more or less exactly to a straight bar curl, whenever I felt like a change of pace. It's simply more comfortable to use the EZ curl bar.