Walking behind her, looking at the way she walks?

Was going to post this in the IQ-thread about Watson, but I need to reach a broader audience.
I have noticed that girls of for instance Korean, Japanese and Chinese ethnicity walk funny. I greatly enjoy looking at women from behind (ahem), taking in their elegant stride. But I am disturbed by the short, fast steps, stiff backs and general rigidness of eastern Asian ladies. Kind of looks like parodies of nerds walking. Add the square pelvic area/hips and the general flatness of their rear parts, I feel they are easily identified from behind. I get it right 9 out of 10 times I make a guess. Anyone else noticed this?
NN