Endurance athletes rely on a training log to tell them when to push harder and when to back off. Use this diary to consolidate your training data, track progress, reshape goals, and gain insight into the way your body responds from day to day. With 53 undated weekly spreads, these diaries are the most comprehensive training logs available. They have space for: weather conditions, resting heart rate, and daily nutrition; charts to organize race results and fitness indicators; and physiological test results such as VO2max and lactate threshold. Take your training seriously and be confident that you're prepared for competition and making progress toward your goals.