There are different types of exertion we express to discover the boundaries of who we are. Boundaries can be our likes/dislikes, fears, conscience, pain/pleasure, etc.
Exercising muscles would be a physical exertion while exercising intuition would be a mental exertion.
Are there other types of exertion that help us to define who we are as we express ourselves here? What are some examples of the boundaries of physical exertion? Examples of the boundaries of mental exertion? Is there a such thing as spiritual exertion?
As physical and mental beings we must exert ourselves, beyond our basic requirements for sustenance, why?