Piety is a disposition and behavior that is based on the recognition and respect of nature. Nature is what is outside of me (that is the metaphysical me, or “I”, — as in “I am”).
A person’s physical body is part of nature. My body is not me. “God gave me my body in stewardship, and God will take it away when God should so decide” is a helpful metaphor to understand that my body is not me, that it is part of nature. My body is outside me, separate from me.
The same metaphor suggests that I have to take good care of my body (maintenance and repairs) to best profit from its capabilities. Think of this: I own my body as I own my horse (or automobile); the care of either is very important to my living. Yet the care of my body is more important than the care of my horse, because if my body dies I cannot replace it.
My body is, by far, my most important possession. It is a most respectable tool because it allows me to live. There is no tool in the world that could serve me better than my body, not even the most sophisticated computer or robots could do it (they cannot tell the love in a woman’s eyes or the perfect doneness of a paella).