RUNNING TO THE best of your ability is something of a numbers game. To hit new PRs, you’ll want to keep tabs on all kinds of stats, like distance covered, pace per mile (or interval), max heart rate, ...

Shakira's personal trainer Anna Kaiser shared the secret to her client's incredible physique and fitness at 49, revealing ...

VO2 max measures your body’s maximum oxygen use and relates to longevity and health. Army’s H2F system uses HIIT to improve VO2 max and overall health. Consistent HIIT, 2–3 times weekly, improves VO2 ...

Running to the best of your ability can feel like a numbers game. To hit new PBs, you’re probably under the impression that you should keep tabs on all kinds of ...

Whatever your running goals, you should execute most of your miles at an easy effort. But when it comes to workouts designed to challenge your VO₂ max, if they don’t feel pretty dang punishing, well, ...

When runners talk physiology, two terms dominate the conversation: VO2 max and lactate threshold. The two metrics are related but not the same, and they shape performance in different ways. Naturally, ...

Running at the best of your ability is somewhat of a numbers game. To hit new PRs, you’ll want to keep tabs on all kinds of stats, like distance covered, pace per mile (or interval), max heart rate, ...

If you haven’t heard us prattling on about VO2 max by now, we’re here once again to tell you just how important this metric is. Once the preserve of elite performance athletes, VO2 max is increasingly ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Running at the best of your ability is somewhat of a numbers game. To hit new PRs, you’ll want to keep ...