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Believe it or not, there's a training shoe you can actually run in. Meet the Nano X4 training shoes with the all new Lift and Run Chassis system. A dome-shaped heel piece compresses under load when lifting to create a stable platform, then softens when you push off to run. It all rides on award-winning Floatride Energy Foam that gives you lightweight cushioning to make that run the easiest part of the workout
