Personally, I think the question of the effect exercise has on my lifespan is irrelevant.<p>A lot of people talk about exercise being valuable because it makes you healthy.  I like all the wonderful benefits of being healthy and in good shape, yes, but I also genuinely like exercise.  There is basically nothing as incredible as the right kind of physical exertion for me.<p>If exercise is a vice, who cares?  It&#x27;s worth it.