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MADRID Upon entering the concrete hall, what you see looks like a strange gymnasium in a post-industrial landscape. The textures of tires, metal and machine are in different structures scattered around the room. In the center, exercise bikes, droppers, sports mats are arranged into a kind of ring with wheels. A display shows the time in digital numbers; another, the temperature. The lights are dim. Enigmatic sounds are heard and, from time to time, some voices. For the latest news & views from every corner of the world, Worldcrunch Today is the only truly international newsletter. Sign up he