Feet back, legs locked, lean into the harness, away from the seat. Never had a problem.
By bending your legs your muscles are fighting the G's. The ultimate bad thing would be to lift one of your legs, I can assure you that's gonna hurt. By standing as prescribed, you are keeping your weight in-line with the direction of the centrifugal force, supported by your frame.
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Jeff
Webmaster/Guide to The Point
Millennium Force laps: 34