Which are the gyms where are most gay friendly / frequented in Bangkok?

The Olympic Club at Pratumwan Princess Hotel (far end of MBK, National Stadium BTS stop) is a very gay friendly place. Most of the clientele are Thai guys who are a bit older. It used to have much younger clientele many years ago. However, it’s still a popular place for gay Asian travelers. The Olympic Club also has great facilities – gym, pool, etc.

Don't all gyms fit the bill, ;p;