yes, exactly
This Drabble strip speaks to me. (Edited to fix link.)
The issue with exercise for me isn't physical exertion; it's time. I'll grant that the net gain is likely to be higher than depicted here. That doesn't motivate me; I find my actual time now more valuable than my hypothetical time at the age of 90.

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"Galen says, in his book of rules for health, that all things have a natural desire for movement and that everyone should practice gentle and moderate exercise, such as the dances invented by the Ionians for this purpose." -Arbeau
:-)
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