To most hotels the important thing about the gym and pool is not that they be good, but that they can be listed in the hotel's "features."

Until there is a way for the prospective exerciser to find out before arrival if the exercise facilities are okay (rather than that they just exist) this will probably not change.

But some hotels do have good facilities, e.g., J.W. Marriott, Bangkok, others have good facilities but want to charge lots extra for them, e.g. Dai Ichi in Tokyo, Biltmore in Santa Barbara.