I don’t know exactly all the gyms in Kunshan, but I’ll do the best I can to describe a few popular ones and their locations:
I've never been inside, but from the looks of things it seems pretty decent.
If you're traveling East down Qianjing Road, head pass Heilongjiang Road and continue over the bridge. Drive about 10 minutes and this gym will be on your right hand side. It's not too far from the Kunshan Convention & Exhibition Center.
They have an outdoor basketball court on the 4th floor, treadmills, weights, yoga classes, body pump classes, very small padded floor area for martial arts practice, cycling classes, and body jam dance classes.
In addition, the gym is directly above an indoor public swimming pool and basketball courts, and is located right across from Kunshan Citizen Park, which is the track & field behind the Swissotel and Kunshan library on Qianjin Road.
It also has an indoor basketball court that often serves for badminton enthusiast. They offer yoga, belly dance, body jam, and cycling classes, as well.
The gym comes equipped with a boxing ring and offers plenty of weight and treadmill machines. In addition, they gym has protein powders for sell, which may be useful if you feel like Chinese food isn;t providing an adequate supply.
The gym is at the intersection of Qianjin West Road and Zu Chong Zhi Road.