I have been to three, all near the North Station.
One is the Green Square next to Moulin Rouge. The environment is generally good, but I think yoga classes and spinning are good. The people inside are not annoying and the atmosphere is good.
One is Kaiwei across from No.15 Middle School. It seems that the taekwondo teachers and yoga teachers there are good, but there are more children in class, which is a bit noisy.
There is also a new one in North Station. What's its name? I didn't pay attention to the hospitality voucher. Just so so
To sum up, the same method always has advantages and disadvantages, depending on which one you like.