The purpose of a fitness journal is to track and record various aspects of an individual's workout routine, health progress, and fitness goals. By documenting workouts, including exercises, sets, repetitions, and duration, individuals can monitor their progress over time. Additionally, a fitness journal can help in identifying patterns, setting realistic goals, and maintaining accountability. This practice can also enhance motivation and dedication, as it serves as a tangible reflection of one's efforts and achievements in reaching fitness objectives.