Ever wish you could breathe easier and sustain more intensity mid-workout? You may have overheard the term "VO2 max" at the gym or on a trainer’s social media page recently—but what is this fitness ...

On TikTok, VO2 max is going viral as the key to improving your endurance during a workout. In short, you can think of this metric as the maximum amount of oxygen your body uses during exercise – V ...

"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 ...

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, ...