It's what goes on behind the scenes that is most important...the invisible part of us. As we live and work and move alongside each other we can't begin to see the inside scene of people. If you could paint the picture of the concerns, problems, worries, motivations and all that we carry in mind and heart you would fill many screens. When we talk about health and fitness we generally talk about the physical body...what we eat and how we exercise. It's a little more abstract to talk about health for the inner person.
But it is the "invisible man" on the inside that is most important. The place where thoughts and emotions form and cook together...the place where our personality resides...the place where dreams begin...the place where we ask the big questions of life...the place where the Lord finds us and the place that we will always carry, even beyond this life.
I got a kick out of "Invisible Man" movies when I was a kid...the idea of moving around without anyone being able to tell you were there. But I greater kick now, knowing that the invisible man I carry all the time is known by a loving Lord, who shepherds that inner person and provides rest here and forever. And how wonderful that the invisible man in each of us can interact in so many healthy ways with other invisible people too!
1 Peter 3:4 but let your adorning be the hidden person of the heart with the imperishable beauty of a gentle and quiet spirit, which in God's sight is very precious.