On weekends, you can go to the boxing sports school and ask about the courses offered by Dacheng Street professional teachers. Baidu is not allowed to have advertisements or talk too much.
There is boxing in the sports school. Ask them the phone number of the boxing coach.
Or Harbin Institute of Physical Education asks Professor Sun Yubin's telephone number. They all set up boxing training classes in their spare time and are regular boxing coaches in the country.