The Fitness Center at The Colonnade Hotel
Colonnade Hotel's fitness center is recommended by travel writers. Out of 14 professionals that we monitored, 4 mentioned the fitness center, including Oyster, Gayot and Star Service.
The Colonnade Hotel 
Oyster
Gayot
Star Service Star Service
Oyster "This 285-room Back Bay hotel offers spacious standard rooms with floor-to-ceiling windows, a fitness center with South End views, and an affordable French brasserie"
Gayot "The rooftop pool boasts spectacular views, while the 1,000-square-foot fitness center offers a view, plus cardio equipment and weights"
Star Service "The gym also offers good views and flashing flat-screen TVs that can entertain during workouts"
Star Service "The gym also offers good views and flashing flat-screen TVs that can entertain during workouts"
