The Fitness Center at Park Hyatt New York
The fitness center at Park Hyatt New York is referenced by those who travel for a living. Of the 14 publications tracked on TripExpert, 4 acknowledged the fitness center, such as Gayot, Fodor's and Oyster.
Park Hyatt New York 
Gayot
Fodor's
Oyster
Star Service
Gayot "The hotel also houses a full fitness center and indoor swimming pool"
Fodor's "The indoor pool is located next to the fitness center on the 25th floor"
Oyster "Features include a spa, a fitness center, and a pool, plus a restaurant serving new American cuisine"
Star Service "The 1,845 square foot fitness center not only has top of the line equipment but also provides beautiful partial views of Central Park"
