If you are healthy enough that you can more easily move around, you may also live longer.
If you have assorted health issues you may also not be inclined to move around much. The "not moving much" may be the result of other health issues, not the cause of them.
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Older people who move around have half the mortality rate of their peers. Well that proves something. No chance of mixing up causation there.
I assume that's sarcasm?
If you are healthy enough that you can more easily move around, you may also live longer.
If you have assorted health issues you may also not be inclined to move around much. The "not moving much" may be the result of other health issues, not the cause of them.