The word 'exercise' is a concrete noun as a word for a physical action that you repeat in order to make your body or a part of your body stronger.
The word 'exercise' is an abstract noun as a word for an activity or set of activities that you do in order to learn how to do something; a set of activities that the armed forces do in order to prepare for battle; an activity that has a particular plan, purpose, or result.
The word 'exercise' is also a verb.
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