Many fitness and nutrition experts suggest using a journal to keep track of exercise and food intake. how can using a journal someone become more fit or change body composition?
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It makes you more aware, especially with food. Often we don't know how much we eat until we write it all out (with calories, fat, protein, carbs, and whatnot). It's a way of self-monitoring. When you track your exercise it can be more of a motivator, to see your progress, what you're working out, your muscle development etc.