The Fitness Center at JW Marriott Marquis Miami
JW Marriott Marquis Miami's fitness center is mentioned by professionals. Of the 8 reviews that we monitored, 2 endorsed the fitness center, such as Oyster and Star Service.
JW Marriott Marquis Miami 
Oyster
Star Service
Oyster "The 313-room JW Marriott Marquis is reminiscent of a luxury hotel in Vegas: Everything is big, from the light fixtures to the bathrooms, and the array of amenities is so extensive guests might not have to leave the premises -- there are three restaurants, a pool, a basketball court, a virtual bowling alley, a 3D theater room, a golf school, and a huge fitness center"
Star Service "The 24-hour gym will please serious athletes, and in-room massages can also be reserved"
