Normally in those low-speed tight turns the riders move their weight to the high side of the bike... this guy's hanging off. I can understand hanging off when moving faster, but some of these maneuvers are low speed tight stuff. And he's grinding away on the hard parts. Impressive.

EDIT: OK, I can see at around the 4 minute mark he's doing the really low speed stuff and he's up to the top of the bike. Just wow.