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59 Kingly Street, With branches all over the UK, Fitness First offers the ability to improve your fitness at your own level regardless of shape or size. They have many facilities including a fully air conditioned gymnasium, qualified instructors, weight loss programs, beauty rooms, spas and steam rooms as well as a licensed bar area.
This is one of the only few gyms in london that opens 24 hrs a day. It's centrally located so it you ever feel the need to work off that after-work pint this is the place to go.