This video demonstrates an imperfect double layout vs a seemingly perfect one of the Uneven Bars.
The first gymnast (Bi Wenjing of China at the 1996 Olympic Team Optionals) pikes her hips, has her feet separated, her chest down on the landing, and wobbles. All of this could potentially incur a deduction.
The second gymnast (Jordyn Wieber - 2011 AT&T American Cup) demonstrates straight hips throughout the flip and a much cleaner landing.
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