The Fitness Center at Le Meridien San Francisco
Le Meridien San Francisco's fitness center is endorsed by expert reviewers. Of the 7 reviews tracked on TripExpert, 3 endorsed the fitness center, including Gayot, Oyster and Fodor's.
Le Meridien San Francisco 
Gayot
Oyster
Fodor's
Gayot "For recreation, there is an on-site fitness center, and guests are welcome at locat fitness centers or the Bay Club swimming pool for a fee"
Oyster "A lobby bar and American grill with outdoor seating provide after-work gathering spaces, and there’s also a 24-hour gym and valet parking (for a hefty fee)"
Fodor's "The 24-hour fitness center features cardio machines, free weights and a stretching area"
