You've probably heard VO2max thrown around in training circles, seen it on your fitness tracker, or had a coach or doctor mention it. But what exactly is VO2max testing, and should you actually care about yours? If you care about your fitness and maintaining your health for the long-term, understanding your VO2max can give you a real edge. Here's what you need to know about this gold-standard fitness test and why it matters for athletes and fitness enthusiasts alike. What VO2