It is a traditional table tennis school, very formal, with professional coaches and venues. The coaches are of high level and rich experience, and some of them are retired from provincial teams. There are classes on weekdays and weekends. But they all accept children, and the adult class is not clear. You can ask.
Oriental Pearl Club, a club run by the mother of former China football player Mu near Nanjing Road Primary School, should have adult classes.
Liangyou club Shibei district Dalian rd market
I still recommend the second stadium, which is more professional.