I remember reading it an article about people who lived in Blue Zones (areas where people tend to have very long and healthy lives) one of the hallmarks was that they all did their own house cleaning

Thanks for adding that perspective about stairs. We're fortunate to live in mountainous terrain, but also at the coast (on the Strait of Georgia between Vancouver Island and Texada Island in British Columbia). There is an enormous set of outdoor steps on a seaside bluff about 30 minutes into my daily walk rising perhaps 250 feet. I love doing them, even if I only plod while the younger and buff bucks sprint past me saying 'Attaboy, grandpa, you'll get there!' And, all that hard work, besides getting me off my backside and out the door, meant that climbing the myriads of steps in the stairwells of cruise ships was a piece of cake, as I was reminded last September during a Mediterranean cruise. I dint need no stinkin' elevators.