Is the spa in Marriott Hotel formal?

Marriott hotel SPA is very formal. At present, the SPA of Marriott Hotel is not operated by the hotel itself. They are all cooperative business models, but Marriott will conduct a very strict review of the cooperative SPA third parties. If you can't meet Marriott's standards for third parties in some aspects, then you can't become a SPA that Marriott signed up to operate in Marriott Hotel.