**Update: The rigs have been updated with new features!
Here they are, all 12 of them! These Maya rigs are perfect for honing in on body mechanics and acting as you develop your character animation skills.
Here's a longer walk through, showing the key new features: http://vimeo.com/joedanimation/bodymech-update1
They will work with Maya 2014 and up, and come with an AnimSchool Picker that can be mapped to any of the rigs by changing the namespace within the picker ui.
You will get a zip file with a maya project containing the rigs, documentation, license info, and picker file.