The well-known formula is simple enough: Subtract your age from 220 to find your maximum heart rate. From there, each “zone” represents a percentage of that HR max number, from zone 1 (easy effort) to ...

We have just the formula you need to sort what your heart rate training should look like.

For when you need to be in "zone 2" and have no idea what that is.

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 ...

That tension becomes especially clear with heart rate zone training, a popular five-tier system that endurance athletes use to measure effort and fine-tune performance. The well-known formula is ...

These days, everyone from the average Susan to the hardcore data-loving wellness enthusiast has the technology to track just about anything in the name of self-optimization. A ring wearable tells you ...