Life in a Centrifuge

I was on a roller coaster recently and I experienced about 1 G. I was not expecting it at all so I was totally unprepared and almost lost my lunch. This is a video of people being trained in an Air Force centrifuge. It gets entertaining when they start to hit 2 G's. At that point you have to flex you legs and butt in order to keep the blood in the upper part of your body. What a rush! [wired.com]