Basically, Jimmy Gilbert and I placed every runner of equal performance ability onto a common economy curve, which meant they would also have the same mathematically generated VO2 Max and a ...

VO2 max has become ubiquitous in fitness circles. But what does it measure and how important is it to know yours? By Talya Minsberg Talya Minsberg took a VO2 max test while reporting this story.

Kettlebells aren't just for strength training anymore. A new study suggests those big heavy balls might be just as useful for amping up your aerobic fitness as they are at building muscle.