Herman Martinus, via Hey Dingus:
That means that over a lifetime, one full year of exercise leads to 10 full years of extra life. That’s a 1:10 return on investment! So even without any of the additional benefits (which I’ll get into later), this is still one of the best investments you can make.
“One full year of exercise” is Martinus’s calculation of exercising for 45 minutes four days per week. So effectively giving up that time to exercise yields a longer lifespan. It’s an interesting way to think about it.
Another interesting take: exercise doesn’t make you happier, but it does reduce negative emotionality.