Studies of health and activity have started to use accelerometers over the past decade. This has shown that even very modest levels of activity - on the order o

Studies of health and activity have started to use accelerometers over the past decade. This has shown that even very modest levels of activity - on the order of washing dishes and puttering around the garden - have a meaningful correlation with health. This is causing something of a rethinking of the lower end of the dose-response curve for exercise. So when looking at the correlations between retirement and health, I'm inclined to think that physical activity level has a lot to do with it.