I don't even know what to say. How could you even go about practicing this? Where would you practice this?
Regardless of the logistics, they did it and it's incredible, and you should watch it. It will inspire you to do better at whatever you're working on, because you will probably realize that whatever you're trying to do, it can't be half as difficult as doing this.
Watch it twice. It won't get old.
Thats just Insane... very cool though.