Apparently he actually had a special shoe to enable these insanely unique moves.  Katie Couric shows us in the video below.  Would you have every guessed that?  Not to mention the shoe was actually patented.  So aside from being an extremely talented performer, he was very clever and/or had very clever advisors.

One of the commenters disagrees:

I dont believe its the shoose.His body and muscule are doing the thing

What do you think?