Dizziness. . Threading training is really unpopular. I only heard that there was a threading teacher contest some time ago. . . I have been playing in Shanghai for so many years, and I haven't met anyone who specializes in this training.

Go to a store like Niu Niu or Miaojiang Sports and ask them how they train. You have to buy balls or something anyway. Just ask, others won't hide too much from you.