We jest, it's not simple at all. Given the demeanour of the pilot featured, it's pretty damn harrowing and makes your face age 30 years in nanoseconds. Apart from that, apparently all you need to do is "Squeeze the leg, squeeze the butt, breathe!" Just like your local pilates class, only much, MUCH faster...
According to The Guardian: "Video posted to YouTube by David Fritz, with the permission of the man featured, shows a gruelling G-force test carried out in a centrifuge. Aviators and astronauts undertake high-G training to learn how to withstand high levels of acceleration during flight, when loss of consciousness can occur owing to G-forces moving blood away from the brain."
Just another day at the office.
