Why is it best to have a resting heart rate below 70 beats per minute?

There is no scientific evidence to suggest that having a resting heart rate below 70 beats per minute is definitively the best for overall health. While a lower resting heart rate is often associated with better cardiovascular fitness and a reduced risk of certain health conditions, the optimal resting heart rate can vary from person to person, depending on individual factors such as age, fitness level, and medical history.

It's worth noting that a resting heart rate below 70 beats per minute can be normal and healthy for some individuals. In fact, well-trained athletes or highly conditioned individuals may have naturally lower resting heart rates without any underlying health issues.