Magicians tend to have some pretty good physical training, so I imagine he was also aided by ridiculously strong calves and a strong core.

Magic videos tend to give you the chance to watch over and over to try and catch the deception though. Watching it once quickly lets the illusion stay so much better than on a recorded TV show. Sadly, I can't perform any of these, but I'm a huge fan of Penn & Teller, who happily expose every bit of Bullshit they perform and still have great show. (See, Trap Door, Teller Smokes a Cigarette on Just for Laughs, Penn gets killed by marshmallows)

weird

actually, I'm pretty sure from how he was standing that he had clips on the heels of his shoes that he was able to hook the heel under the edge of a grate or something. But yeah, he still needs strong calf development to be able to do that...