The Fitness Center at Marriott Marquis San Francisco
San Francisco Marriott Marquis's fitness center is endorsed by those who travel for a living. Out of 8 professionals that we tracked, 4 acknowledged the fitness center, including Oyster, Gayot and Star Service.
Marriott Marquis San Francisco 
Oyster
Gayot
Star Service
Fodor's
Oyster "This 1,499-room business behemoth ideally straddles SoMa, the Financial District, and Union Square, and clearly caters to meeting attendees with its multiple restaurants, huge fitness center, and comfortable, if unexciting, quarters"
Gayot "The hotel boasts a spa and fitness center, an indoor pool, a business center and three restaurants"
Star Service "Recreation, despite serious investment just a few years ago, has dropped down to a modest gym where a spa, whirlpool and indoor pool once reigned"
Fodor's "Cor Health + Fitness Center features free weights, cardio equipment, running machines, weights, and more"
