Nice technique for maintaining volume when the arm is rotated in X (in this instance). Gives a smoother falloff between sections of the arm. The video below goes into greater deatail the procedure to create this arm rig.
Arm Rig 2
This video explains the technique to achieve the results featured in the above video. I have seen this a few times before, notably in Jason Schleifer's "Animator friendly rigging" series (well worth a watch!). The arm setup consists of two joint chains. The first is a simple chain that controls rotations, the second is the skinning chain which controls the falloff when the arm is twisted. To do this a multiply divide node is created and its input 1x is hooked up to the first joint chains twist rotation (in this occasion it's the Z axis). The value is then divided by 4 (or multiplied by 0.25 - same difference) and applied to the corresponding joints on the second chain. This is possibly how that nice falloff was achieved in the one eyed footballer rig that featured in Edoardo Pili's impressive reel.
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