Chief executive Christian Ask and country manager Natalia Folbrycht were at his side.
The Sweden-based gym chain allows members to design their own workout routines and access the facility 24 hours a day, seven days a week.
With their membership card they can access all Fitness24Seven gyms worldwide.
There is a variety of gym equipment, group training classes and a Women Gym area, all for Bt1,299 per month.