If you read any running magazine or book about how to run a marathon, you will find out that it is pretty basic. You spend several weeks training and building up your mileage while practicing your nutrition and hydration strategy until you taper off in time for the big day. Next you show up for your event on the start line totally focused and prepared as you wait for the claxon to go off. Then you run past the start line, start your smartwatch and keep going while drinking and eating as required until you reach the finish, stop your watch and relax. That about covers it, right? Well…