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
Also, don't underestimate the current benefits. I agree that benefits when I'm 90 aren't motivating, but I've got pretty clear evidence that regular exercise makes an *enormous* difference in my mood, outlook and productivity. So in terms of overall accomplishment, I suspect it's about a wash: I lose an hour, but gain in doing more with the remaining time...