Informant is my friend that has grown up in Taiwan and Canada, while also studying in LA.
I personally hate looking at people who shake their legs, especially seeing you do it so much annoys me so much. My dad used to say that it is bad in our culture because it is a sign of boredom as well as a sign of losing wealth. In ancient China, if you were to shake your legs, it is like shaking away your wealth. If you kept shaking your legs, you would lose all your coins as they would slip out of your pockets. That is why I always tell people this story to help them get rid of their bad habits.
I have a really bad habit of shaking my legs, after hearing this story I felt that although it does not really happen in our age with the invention of wallets and deep pockets, it is still partially true and definitely a better thing not to shake one’s legs.