Get to know the link between your effort level and your heart rate. Plus, how to use heart rate to your performance advantage ...

When you think about how fit you are, you might think about how far you can run or how many push-ups you can do. Or maybe you ...

Whoop, the screenless watchband-like wearable, has just added a VO2max feature to its app. Now, just like Garmin, Apple Watch ...

Rowing machines and treadmills do not challenge your cardiovascular system in the same way, so what is the science behind it?

Or maybe you think about health metrics like your resting heart rate or heart rate variability ... fitness that you may be ignoring: your VO2 max. VO2 max is a score that quantifies how much ...

Have you ever completed an 800m sprint faster than your lactate threshold pace, only to find your heart rate did not reflect that effort? This perplexing scenario is not as uncommon as one might think ...