Believe It Or Not, There'S A Training Shoe You Can Actually Run In. Meet The Women's Reebok Nano X3 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.