@hypothetically thank you for a very comprehensive review of the various gyms in HK!
For the upperwestisde, the choices are basically limited to Equinox, Crunch and NYSC. There are also a number of boutique gyms that personal trainers use to work with their private clients.
I was a member at Equinox 92/broadway and 76/Amsterdam for a long time. Equinox offers an excellent service but in the end I decided it wasn't worth their ever-escalating membership fees. I didn't use their trainers, didn't use any of the group classes and I certainly didn't feel like paying for their scented towels. Equinox is selling too many memberships for the size of their locations and it got horribly crowded during rush hour. To the point that getting a workout in became a challenge. Many women favor Equinox, I guess because it is clean. The female clientele at Equinox tends to be very snooty which is a huge turnoff. In fact, I should write a separate post about why women don't belong in gyms. As a plus, I will say that the personal trainers often are hot and some are 'available' to their male and female clients.
NYSC on the upperwestside is really 'hit or miss' depending on location but more often 'miss'. Badly maintained and broken equipment. The steam room at the 82/Broadway location is basically a sex club that has been closed down by NYPD several times. Some of the clients are just there to hang out and cruise in the locker room - you never see them in the gym space. It grossed me out.
I currently use the Crunch on W 84. It is not a great gym but it is priced correctly for what it is. It has all the equipment I need at a reasonable rate. The crowd is gay-ish. I do see quite a few of the local escorts working out there. Some of the personal trainers there are quite good and at a more affordable rate than Equinox.
Just my 5 cents for the upperwestside.