OMG! WHAT THE!?!?
How do u sit on the pedal without it moving?
Just INSANE!!!
I'm pretty sure that's Alex W., and I believe he's using a "roller coaster"(?) freecoaster mod... the mod was invented by Jones way back; basically, the hub functions like a coaster brake in that you pedal back and the cranks won't move (like a traditional coaster hub), but it doesn't "brake" the wheel and stop the wheel from spinning.
^ if any of that isn't accurate, please correct, as I'm only going by what I can remember...