Fitness First - Club 39
55 Biohouse Building 8th Floor Sukhumvit 39 North, Klongton, Watthana, Bangkok 10110
The pool makes this distinct among mid-Sukhumvit gyms. Lead with the cycling studio if you need structured cardio, or book the aerial flow yoga sessions for something less predictable. The 46-hour advance booking window means spontaneous drop-ins are off the table.
You step off the lift on the 8th floor of Biohouse Building and the lounge area opens in front of you, towel service and complimentary toiletries already set out. The gym spreads across dedicated zones: free weights and loaded weights in one section, a freestyle training area with a monkey bar for functional work, and a separate cycling studio for spin classes. The swimming pool sits at the far end, available for lap work and aquatic training.
The hot yoga and aerial flow yoga studios run on a schedule you book through the mobile app. Classes fill 46 hours before start time, and walk-ins are not accepted. Personal training operates through internationally recognised programs, and every member gets access to MYCOACH, an 11-point assessment and progress tracker that logs your advancement session by session. The system syncs across the Fitness First network, so if you train at another club the data carries over.
The sauna and steam room sit adjacent to the changing rooms. Locker rentals include a shoe locker option, and WiFi runs throughout the floor. The combo studio hosts group fitness classes, and cross-club access lets you book sessions at other locations when this one is full. Membership tiers vary, with higher-end options unlocking additional perks.
The building entrance is on Sukhumvit 39, a short walk from BTS Phrom Phong. Street access is straightforward. Operating hours run 6AM to 10PM Monday through Friday, then 8AM to 9PM on weekends.