A training diary helps you visualize and monitor your workouts. Seeing your workouts in numbers and visual graphs can boost your workout motivation and inspire you to keep going – as seeing fitness results may take some time (it always does). If you're using a fitness watch with an app, like Polar Flow, to track your workouts, your fitness data will be logged automatically with stats for each workout and summaries of your training hours, sessions, calories burned, heart rate zones, training benefit and training load.