The ego is absent from the causal body, and the spirit can know its true potential here. Ideally, the spirit transcends all bodies and becomes pure consciousness, an individual expression of the divine. On the other side of the spectrum is the Westerner. Traditionally, the Westerner sees one part of the self at a time. The body is the body.
Healthy food keeps it running, and exercise keeps it strong.
End of story. Then there is the mind. The mind is the source of intelligence and thought. Activities that stimulate the mind, from philosophical conversations to crossword puzzles, keep the mind active. End of story.