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

The heart rate zone formula is flawed, especially for women. Here's how to rethink your training. These days, everyone from ...

If you're a lifelong powerlifter or bodybuilder, there's a good chance you're more concerned about growing your glutes, carving your core, or building your biceps than boosting your VO2 max. But for ...