The Fitness Center at Hotel de Crillon, A Rosewood Hotel
Hotel de Crillon's fitness center is referenced by professional reviewers writing for major publications. Of the 13 reviews that we tracked, 2 praised the fitness center, such as Lonely Planet and Fodor's.
Hotel de Crillon, A Rosewood Hotel 
 Lonely Planet
 Fodor's
 "Facilities include an indoor pool, on-site spa, 24-hour gym and two internal courtyards" 
 "The well-equipped guests-only gym offers a half-dozen different types of state-of-the-art fitness machines, weights, sauna, and steam room"