> Note that I did not say my lifestyle, I said my mentality. I am unable to be active.
This is a fixed mindset vs a growth mindset; that itself is the over-arching lifestyle choice you are making.
Getting in shape is painful, but after 6-8 weeks of a routine, your body adapts and it becomes much easier, even enjoyable to some people. In 2 months, you could have the data to know what your body is actually capable of.
> If I aggregate all those activity hours together.. it could maybe worth a couple of years of my life.
Do you really believe that? Would you tell this to a doctor, or teach this to a child?
I'm no expert, but a few reasons why its very unlikely a linear model applies here:
1) You increase risk of a life-ending event like a heart attack.
2) You are not combatting the effects of stress, which is suspected to be highly related to the feeling of time passing faster as we age.
3) Particularly as you age, your cognitive ability will decline relative to your potential. You'll be a worse programmer than you could be at 40+ - memory, psychomotor speed and executive function in particular will decline vs potential. Simultaneously you will be more likely to get dementia.
I think if you factor these things in your expected years, and expected quality years, of life would change significantly from your estimate. Further, there are plenty of ways to exercise that people consider to be an inherently good use of their time for a variety of reasons.