I definitely have an odd posture/gait, although I've improved markedly since I was younger.
My walk, if I don't consciously control it, is fast, head down, shoulders hunched, and feet shuffling. As a result of not lifting my feet enough, I tend to easily trip over pavement cracks and other minor obstacles that most people wouldn't even notice. But the most obvious anomaly is the way I hold my arms. I have them sort of t-rex style, or like a Yoshi (Mario games). Bent at the elbow, tightly at my sides, and jutting forward with my wrists hanging limply.
I can walk more 'normally' if I make a conscious effort, but inevitably, my arms do that dinosaur thing again. To me, it doesn't make much sense... my balance is awful anyway (I have Dyspraxic tendencies and very weak muscle tone), so keeping my arms pinned to my side at the elbow is counterproductive to keeping good balance, especially when I'm so liable to trip.
But I can't help it
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~I wanna fly high, so I can reach the highest of all the heavens
Somebody will be waiting for me, so I've got to fly higher~