An exercise instruction system includes: a body motion detection device (measuring device) which detects a body motion of a user; a muscle mass measuring device (measuring device) which measures a muscle mass of the user; and an exercise instruction device (information processing device) which presents an instruction content on an exercise that should be carried out by the user, on the basis of a result of detection by the body motion detection device (measuring device) and a result of measurement by the muscle mass measuring device (measuring device).
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