When I was in college an obese guy, let's call him Billy, in my dorm told me that he didn't exercise because we only have so many heart beats in a lifetime and he didn't plan on wasting his running. I told him since my resting heart rate was much, much slower due to my elevated heart rate during my runs that my heart beat fewer times daily than his. Therefore, by his theory running was extending my life.
I guess you could say I agreed with him about part of his argument.
I was told that a few years ago, Billy had a heart attack in a bar, staggered to a long table lined with the attendees of a bachelorette party, and fell in its middle sending drinks and assorted salty snacks and candles flying onto the nearby dance floor. One of the girls, thinking a drunk had wiped out their party, whacked him with her purse before she realized he was stone cold dead. He had reached the end of his heart beats.