For me it's not even about trying to be some kind of athlete, but just maintaining my health and mobility as I age (I'm not that old but we're getting older every day, or at least that's what they tell me). I think unless you're pitching bales of hay (even farmers use machinery for this now) or swinging a framing hammer all day modern lifestyles don't provide the needed level of physical exertion to prevent atrophy.