Having robust aerobic fitness allows you to put in more work and reduces your risk of injury. And it’s by far the best non-medical indicator we have of a strong, healthy heart.

Yet, aerobic fitness is often just an afterthought. Unless you’re an endurance fanatic, aerobic fitness is one of those things people trust takes care of itself. As long as we keep active.

I know I was as guilty of this as anyone. But instead of hoping, it’s worthwhile to look at the actual numbers.

Measure your resting heart rate, fresh out of bed, for a month. If you average over 60-63 beats per minute, it’s a sign that your aerobic fitness needs improving.