Difference is just 5.8 per 1000 person-years. The effect size is very modest. You spend more time in exercising than increase your lifespan. The metaphor is literal, you are running from death and disease, and death is running faster. What we need is review studies ranking lifestyle and health regimes by their effect size and combined effect sizes. Almost certainly combining two effective regimes increases the life-…
The healthy person has less stress, sleeps better, has better sex, has better mood and energy and isn't spending most of his life having difficulty dealing with illnesses steaming from unhealthy habits.
Additionally, the time spend exercising isn't wasted, it's quiet enjoyable thanks to the release of Endorphins. Not to mention that it helps build muscles and keeps your body in shape which makes you more attractive to the opposite sex, thus increasing the chances of finding a partner. You also get all the cognitive benefits mentioned in the article for free.
To top if it off, the time commitment isn't 8 hours a day. It only requires an hour every 2 days or so (it varies depending on what you're trying to accomplish).
I highly recommend it.