The best way to interpret studies like these IMO is that there's probably causality in both directions. If you develop health issues then you're less likely to

The best way to interpret studies like these IMO is that there's probably causality in both directions. If you develop health issues then you're less likely to be active, in some cases it might not even be possible. So really the main benefit of exercise and keeping fit is to stop problems from happening in the first place.