The Fitness Center at Capitol Hill Hotel
The fitness center at Capitol Hill Hotel is acknowledged by those who travel for a living. Out of 8 reviews that we tracked, 3 mentioned the fitness center, like Frommer's, Oyster and Star Service.
Capitol Hill Hotel 
Frommer's
Oyster
Star Service
Frommer's "Other pluses include a well-equipped fitness center and displays of original art by local artists"
Oyster "There’s no pool or spa, but the hotel does have a large, well-equipped fitness center that's open 24-hours"
Star Service "The hotel has a 24-hour gym and three dedicated meeting venues for up to 40 people"
