The Fitness Center at London Marriott Hotel Kensington
The fitness center at London Marriott Hotel Kensington is recommended by professional travelers. Of the 4 professionals that we tracked, 3 recommended the fitness center, such as Gayot, Oyster and Star Service.
London Marriott Hotel Kensington 
Gayot
Oyster
Star Service
Gayot "The luxurious Marriott Leisure Club has a gym, a large indoor swimming pool, sauna, whirlpool and steam rooms"
Oyster "Another option in this posh London neighborhood is the comparably priced Nadler Kensington, which has more English character and room amenities fit for longer-term stays, but no gym"
Star Service "A health club with gym, sauna, and steam room are on-site"
