The horizontal surface of a gym floor is not the most efficient use of space. The underutilized vertical surface the side is a much more space efficient workout facility.
Check out the architecture of this dorm at the University of Twente in the Netherlands by Arons and Gelauff Architects. This is definitely the product of designing and constructing spaces that reflect and functional, aesthetic and environmental considerations.
The dutch must belay this building using non-standard ropes for this pitch. This building is 9 stories tall, or 90 feet. Climbings ropes are 60 meters long, or 196 feet long of rope. 6 feet is not enough belay slack.