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 ...

Whether you’ve just recently gotten an Apple Watch or have had one for a while and haven’t used cardio fitness, it’s a valuable measurement to understand and use. Here’s how Apple describes it: ...

If your weekly schedule looks like a jigsaw puzzle, squeezing in both cardio and strength training can be tough. Instead of making cardio feel like yet another looming item on your to-do list, let's ...