Posture was the way one carried oneself, particularly the orientation of one's spine.

Exercise, such as fencing, could improve one's posture. Hikaru Sulu mentioned this to Kevin Riley in 2266 while attempting to interest him in the sport. (TOS: "The Naked Time")

Bad posture, on the other hand, could lead to back problems, such as a pinched nerve. In 2373, after Odo had become humanoid, Doctor Julian Bashir diagnosed the former changeling with a pinched nerve resulting from his bad posture. Odo seemed surprised, as he usually sat straight up in his chair, until Bashir explained that he was too rigid. When Quark saw Odo in pain, he blamed bad posture, too. (DS9: "The Begotten")

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