I’ve done some research after rudely finding out Randall was watching me use up my limited amount of heartbeats….I found that most sources say mammal and human hearts will beat between 2 and 3 billion times. That’s a pretty big discrepancy, but it depends on how long the person lives. The worldwide average life expectancy is supposedly 65 years old (2 billion beats), but I might be lucky enough to reach 95 years of age (3 billion beats). All in all, doing cardio regularly actually slows your sitting heart rate and therefore helps you out in the long run. Hah! (I made a pun.) So Randall started running with me!