Blue Angels Straight and Level
Blue Angels straight and level (almost) at Sea Fair, Seattle 2011.
The standard demonstration configuration is such that the pilot must overcome 40 pounds (18 kg) of nose-down stick input to maintain level flight. The Blue Angels do not wear G-suits, because the air bladders inside them would repeatedly deflate and inflate, interfering with the control stick between the pilot's legs. Instead, Blue Angel pilots tense their stomach muscles and legs to prevent blood from rushing from their heads and rendering them unconscious.
Canadian Airline Blog