The Park Club fitness center and spa occupies one end of the 24th floor with its gym, and spa treatment room on the floor level below by an airy internal staircase. Wide-planked wood floors in warm hues and a smooth celling plane covered with strips of downlights emphasize the horizontality of the gym space, which seem to continue out into the city sky. With three walls of glass, the gym has incredible views of downtown Seoul. The open space is grounded at the perimeter by only a few columns and the boldly geometric X-shaped cross-bracing of the building’s structure.