To be physically fit is just a small aspect. You can be a beautiful physical specimen, but you're empty as far as what it takes to be a person, and that shows up real fast.
“I met my second husband on a bus. We looked at each other and that was it. We were both married to other people at the time and behaved badly, but we didn't seem to have any choice. We were very happy for nearly 50 years and would still be together if it wasn't for the bloody railways.”