Plenty of research touts the importance of cardiorespiratory fitness (CRF)—also known as cardio fitness, cardiovascular endurance, and aerobic fitness—as a health marker, as well as an athletic ...

You might know your weight, your step count, or even how much you can lift at the gym. But do you know how fit your heart and lungs really are? Cardio fitness, or the cardiovascular endurance, ...

Groundbreaking new research finds that an increased cardio fitness level will reduce your risk of death from any cause by nearly 20%. Running, cycling, or swimming -- if you regularly exercise, you're ...