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 ...

Calculate your target heart rate zone and work to stay in the middle of that zone while you’re doing your cardio. Here’s how you do it: According to the American Heart Association, a person’s target ...

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 ...