The boy's shaking his legs shows his character?

In a word, people are shocked and blessed! Whether men or women, the posture of sitting is unstable, and people who sit in chairs are impetuous, impatient, unreliable and unstable. This kind of character is hardly blessed. The man's shaking makes people feel like a bum, and the woman's shaking makes them feel not reserved and not ladylike. The first impression given to others is poor, so don't shake your legs if you have nothing to do. Looks ugly.