Surveys on lifestyle and longevity consistently find that people who do more exercise live longer. So it is surprising to see a report from the Finnish Twins Cohort Study that there is little direct effect of “leisure time physical activity” on lifespan. What makes this study different from others – and is it right? Human behaviour and biology are complex and interact with wider society and the environment.
How much exercise a person gets could be linked to their genetics, diet, disabilities, education, wealth, or just whether they have enough leisure time and a safe green space. Each of these factors could also be linked to lifespan in different ways. You can probably think of a dozen other things that might be associated both with a person’s health and the amount of exercise that they do. The direction of the causation will not always be clear. Although it is certainly true that people who exercise more will, on average, live longer, it is far more difficult to know how much is caused by the exercise itself, versus these other factor
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