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.

no subject
I do manage some exercise by walking or biking to work when I can. And I can justify that to myself because I'm getting some time alone with my thoughts, and it's good for the environment. But I just do not understand going to a gym.