Your watch’s VO2 max isn’t perfect, but you can improve its accuracy with better data and heart-rate tracking.

New VO₂ Testing Insights Suggest Popular Fitness Metrics May Be Leading to Ineffective and Counterproductive Workouts ...

Understanding our body's target heart rate zones and how they change as we age is crucial for getting the most out of our workouts. If your goal is to burn fat, for example, you'll want to stay in ...

Running with a high heart rate is often a clue to overtraining or needing to take a step back in the base building process. But it could also be a gear issue or a deeper health signal. Let’s talk ...