The gym, with cardio equipment, weight machines, and free weights, is an enclosed, air-conditioned facility. The aerobics studio is right outside and is an open-air space. There are fans, but they don't do enough.
I really wish CN would change this; when the resort originally opened, the weight machines and aerobic studio were in the same spot and the cardio equipment was in another room nearby, but both areas were air-conditioned.
I know everything, and I'm always right (just ask my husband).