I went there twice for group boxing classes. I left the third time when I was attempting to book into a grappling class. This was part of an attempted process on my part to try the different classes offered there and see if I wanted to purchase one of their various membership cards.
The boxing classes were fun, a great workout, and the coaches and fellow students were all nice. A good atmosphere. Certainly room for improvement, especially in terms of explaining the class structure and fundamental concepts of the sports to beginners...but overall good.
However, on front desk staff member erased the positive aspects of the gym through his unprofessional and rude conduct. I was treated like some sort of con-man for wanting to try out the different classes offered before committing to multi-thousand RMB membership card, despite my willingness to pay per class to try them out. I wasted my time riding over to the gym on a very cold day on my scooter and then being refused service unless I committed on the spot to buying a membership card in direct contradiction to the gym's own policies and written price table. Also wasted was my friend's time and money, as she was in a cab on the way over to the gym in order to join me for the group class at the time I was refused service. My exchange with the staff (in which I was not terribly satisfied, but remained calm and reasonable throughout) was topped off with a remark from the one particular staff member with xenophobic undertones.
As one may see from my other reviews on this site, I typically try not to say anything unless I have something nice to say. In this case, I feel I must make an exception: I don't think it's a business that deserves your effort or money.