Is exercise a concrete word

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.