He's saying that it's not BS that you have a given maximum # of beats in your life AND by exercising, these beats span more years. The comment about heroin is ridiculous. Obviously regardless of your max beats, your lifestyle can & will affect your lifespan. I doubt he thinks that everyone actually achieves their lifetime maximum. But that doesn't mean it can't still represent your maximum. Not that I necessarily agree that a person has a maximum # of beats. It just doesn't seem too complicated that it could be true, but you could also be extending your years by exercising.