Karlsen Squat:

[anvar]

what's is it?

 

[Chrono]

It's a reverse hack squat. There's an old thread about it here: http://www.sherdog.net/forums/showthread.php?t=181502, but unfortunately I can't find the clips anymore. You'll have to buy his DVD to see for yourself. Supposedly it's a good assistance lift for the tire flip.