I've Got Too Much Life, Running Through My Veins, Going To Waste

Do you think every person is given a definite number of heartbeats for a lifetime?
Maybe a billion beats and your heart will stop. No, evolution is not done yet but at least it's inclusive. Maybe a billion beats each with a certain magnitude.
This would mean that for those athletes with a low resting pulse rate, they'll get to live longer because their hearts have to work less on normal times. But on the other hand, their hearts are subject to vigorous use during their training hours which would mean that... well, maybe the lower resting pulse rate compensates for the time they have to work hard hence they end up having an average life span as long as other factors don't come into the equation.
Which might also explain why healthy and fit footballers drop dead for no apparent reason at all. Maybe they've overused their share of heartbeats. Maybe they were unfortunate and were given a lower number of beats to begin with... life ain't always fair. In fact, it never is.
That would also mean people who meditate will eventually live longer. Which is kind of true. But then scientifically we don't know if they live longer because their hearts don't use up all the reserve beats or for other reasons. One thing we do know is that people with lower heartbeats tend to live longer although these two issues cannot be tied together as definite. There are too many reasons to die (and it seems as if there ain't enough reasons to live).
This also brings to mind the case of the periodic exercisers. These are people who exercise every once in a blue moon when they think a day of vigorous work out will be able to trick the weighing machine about their past ingestions. Does this mean that because they won't have a lower resting pulse rate at normal times AND they subject their hearts to hard pumping at other times, they'll eventually live shorter lives?
Could it be that if you're not gonna do exercise until you reach a point of lower resting pulse rate, you better off not exercising at all?
But with all due respect, I would much rather risk not definite the shorter life span than being 1) out of shape 2) obese 3) have high cholesterol levels in my blood which will DEFINITELY lead to heart attacks. So for those of you looking for reasons to not go to the gym, this isn't it.
I'm merely speculating.
On th case of the dying footballers, another speculation (from me so don't take it too seriously) is that their heart rhythms might have accidentally been affected during hard collisions. We know for a fact that their hearts are already working very hard during matches and that some times, the struggle for the ball might get a little rough so there is a possibility that one might get struck on the chest during the struggle. A hard blow to the correct (or incorrect) area might cause the already drained heart some confusion hence causing it to go into cardiac arrhythmia. This might not be apparent at first but when the body is asking for so much, even a minor alteration will seem significant and cause a heart attack. Could it be?
You might not bother about all this but why these people who seem to be the epitome of health can just fall dead is beyond me and it really bugs me.