Okay, okay. I'll tear myself away from my busy schedule of having canceled flights or not flying to give you the lowdown on the PLF's.
The first day you spend jumping of platform about 4 ft tall onto gravel simulating the landings that you would do when parachuting. If you've see Independance Day, when Will Smith ejects and them lands on the ground, well, that's how NOT to land. After spending most of the day doing that (and getting drug across the ground by your buddies) you go home crawl into bed because you're so damn sore.
The next day they take you out Horak Field (DON'T FLY OVER IT!!!!!! Immediate down in the plane). Like John said, they hook you up to the back of a truck and start pulling. The first time you're tethered, the second they let you lose. It was actually a lot gentler than just jumping off the 4 ft platform. I was really surprised. The second day was pretty cool. I was worried about injuring (sp?) something, but if you follow their directions, you won't. And I even landed on my knees on one and was okay.
By the way, PLF is Parachute Landing Fall. Hope that helps. Let me know if you want more info.