I have met people who figured, because they don't excercise they don't wear their body out, so their joints etc. will last longer. Same for injury, no sport no injury, that must be good!
I got codex to count my total heartbeats from my Garmin data. For four random days the counts were 72.252, 73.823, 68.922, 70.991.
According to google: "typical range for total heartbeats is 86,400 to 115,200 beats per day"
I run every day which would add a lot of beats, but my resting HR is 36 (pushed down by exercise i presume) with a daily average of 50 BPM. So in total a trained person may spend less of their heart beats.
Charlie Munger thought of exercise as adding mileage to the car.
Donald Trump is one who also believes this. Apparently he believes you only have so many heartbeats, and so you should avoid increasing your pulse.
In a way this is right with high intense/extreme sport. (I did Thai Boxing in my youth, but stopped at some point)
But it is very wrong otherwise, joints for example will suffer if not moved. Blood will only flow into all the areas of the joints if they are moved. And if you don't move, your muscles will be gone and without muscles to hold your joints, loss of stability, great risk of injury, etc.