I have a strange question, but stay with me: Have you ever thought about how long you can run without breathing through your mouth? In a dark basement in central London I recently discovered that, for ...

Zones are based on your heart rate, but each app has its own idea of where they start and end.

A longevity expert explains why focusing only on cardio after 40 is not enough. While cardio improves VO2 max, maintaining ...

VO2 max is a buzzy measure of heart health and fitness. I tried a class that promised to boost my VO2 max through cardio and breathwork. I don't typically do cardio, and I realized taking classes ...