Workout is good, energy-saving is good, a floating gym powered by passengers’ workouts is good? Honestly, I don’t really think it is a good idea. Designed by Italian architects Carlo Ratti Associati, The Paris Navigating Gym is a 20-meter long fitness vessel that can host up to 45 people. The fitness area features Technogym’s ARTIS machines – a special typology of sports equipment that harnesses human energy and makes it available to further uses. By doing exercise on the ARTIS bikes and cross trainers, guests can seamlessly contribute to powering the boat, which in turn will sail along the Seine on its route through the city. The Navigating Gym will allow Parisians to inhabit the river all year long. The augmented-reality screens installed on the boat will show guests both the quantity of energy sourced from the workout, and data about the Seine’s environmental conditions, tracked in real time by sensors incorporated on the vessel.