I have a sign in my office that reads “What would you do if you knew you would not fail”. To move forward in any task with the supreme knowledge that you would be successful no matter, what would provide a level of confidence in one's skills far beyond the limits of most people. To work towards this level of confidence, to build your mental abilities and belief in a positive outcome it starts at the beginning. Documenting the details of when, where, temperature, distance, nutrition, equipment, and outcomes will allow you to make any necessary changes to achieve optimum results. As you train, log the physical work, training nutrition, and note what was and wasn’t ingested, how each work-out felt, and how well you recovered. Record the temperature and what you wore, measure your sleep, resting heart rate, and the stresses of everyday life along with how rest affects your body. You can’t change what you don’t measure so if you have noted all of your training parameters you should arrive at race day with confidence knowing what to wear, how much water to drink, carb replacement, and electrolytes you will require given the temperature and how your body will respond.