A runner can spend weeks, months or even a whole year preparing for a target marathon. Yet, despite every effort to finish the race faster, that runner can unconsciously do dumb things that sabotage their race.

This book lists 20 simple things you can focus on before you start your marathon. Often as late at the night before the race. Eamonn has seen many examples of experienced and well prepared runners ruin a great performance by something simple or silly done or not done the day before, the night before or right before their target race.