Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. Plenty of fitness ...

If you gather a group of runners together, you’ll often hear the same kinds of chatter. Sure, race PRs and training niggles will probably predominate, but there’s another topic that’s been ...

Are you tracking enough of your fitness metrics yet? No? Great! Here's another one: VO2 max. It's a measurement that's traditionally been used by elite athletes, especially runners and cyclists, but ...