How do u do a "seat out hop"

after checking out some really good unicyclists seat out hopping, aka Kris Holm.
i know that the pictures of him are manipulated, but to a degree he is still doing a “seat out hop”

do any of u guys know how t o do these?
or could u tell me where i could find a tutorial to learn how to do them?

cheers

search them on the forums here, coz i know there has been ALOT of the same qstions asked that u r asking now! but kris holm has a tutorial on sif hops if u wanted to check it out (its a vid)
http://www.unicyclist.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=129555&g2_serialNumber=2&g2_GALLERYSID=233755dcef26bde4b36ed87400e49e7b

And ryan atkins has a how to vid on sif hops aswell, but they r more concentrating on wheel compression to get bigger sif hops, but u can check it out newayz, its in the forums !! (search for it)