Needs A Better Title. I just can't think of a shorter one that covers all the important points.

A stock pose for cheerful ladies roughly from adolescence to mid-twenties is to stand with their arms behind their backs in some fashion. Often accompanied by standing at an off-angle, or twisting a little at the waist.

This is Truth In Television, and has been a popular pose for a number of years. In fiction, it's often one of the ways to set off the more lighthearted, optimistic, and/or flighty young ladies from the more serious, cynical, and/or grounded ones.

Compare this trope (why I need the title to be distinct).

Contrast Rebel Relaxation.

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Examples:

• Quinn from Daria
• Vanille from Final Fantasy XIII
• Selphie from Final Fantasy VIII
• Adelle from Arc Rise Fantasia
• Belle does this at one point in the skating scene in Beauty And The Beast The Enchanted Christmas.
• Momoko does this sometimes in Wedding Peach. Sound, one of the Filler Villains in the anime, does this once or twice as well.
• Asuka does this sometimes in Neon Genesis Evangelion, betraying the "adult" facade she puts on.
• Wilma Deering does this occasionally in Buck Rogers In The25th Century.
• In the figure skating long program of the 1994 Olympics, Oksana Baiul did this in one of the "bouncier" parts of the medley she skated to.

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