He's a little bit handy........

[ChristoT]

slightly OT, but what sort of changes get made to a bike like that to help it be thrown around like that. I see he has a bigger rear sprocket, i assume there is also the ability to control the rear brake from the handlebars?

Yeah, the stunters use a thumb brake for the rear, or a double lever system on the left. Also dented in tank (for sitting on), maximum weight saving on it for flicking it about, loads of minor details. There are some cool vids on Youtube of stunt riders going over their bikes.