The Fitness Center at Novotel London Tower Bridge
The fitness center at Novotel London Tower Bridge is recommended by those who travel for a living. Out of 2 professionals that we monitored, 2 mentioned the fitness center, like Oyster and Star Service.
Novotel London Tower Bridge 
Oyster
Star Service
Oyster "The hotel also has modern wellness facilities like a small spa area, a gym, and a sauna, as well as family-friendly amenities like a game room"
Star Service "A gym, sauna and hamman one floor below are nice touches for a hotel of this size, though the gym equipment fills up fast on weekday mornings"
