Fit individuals use about 10% fewer heartbeats per day thanks to lower resting rates, showing the heart’s remarkable efficiency with training. Regular, moderate exercise boosts longevity and makes every beat truly count. Credit: Shutterstock Forget the old idea that physical activity drains your supply of heartbeats. New research from Australia shows that people who are physically fit actually use fewer heartbeats each day, which may help them live longer. According to the study, athletes had