VO2max is a measure of cardiovascular fitness, and many watches and fitness trackers can estimate it for you. Here's what you need to know.

Choosing your pace based on threshold is more effective than calculations based on maximum heart rate, research shows.

VO2 max has become ubiquitous in fitness circles. But what does it measure and how important is it to know yours? By Talya Minsberg Talya Minsberg took a VO2 max test while reporting this story. She ...

Understanding your heart rate can be helpful to calibrate your perceived exertion, especially on easy and steady runs. This ...

Thanks to the proliferation of smartwatches and fitness trackers, it’s never been easier to log your heart rate while running: Simply don the device, start your workout, and watch those beats per ...

Key Takeaways Strong heart health means your heart and blood vessels, aka your cardiovascular system, are working efficiently ...

Running in zone 2, by definition, should feel easy. And that’s a good thing, considering zone 2 runs make up the majority of any good training plan. These easy efforts serve as the building blocks for ...

The issue: Many runners (particularly women) report that their fitness trackers tell them they’re exercising in a higher zone ...