I think in general it’s good to do something, anything that requires some sort of effort/exhaustion: keeps us even keel about ourselves. This idea of progress, of improvement, of staving off the undertow of time and decay. Not to put a too dismal point on it, but the remarkableness of the human body lies in it’s ability to generate, regenerate and perpetuate.
It is the only machine we get to keep for a lifetime.