VO2 Max: Why It Matters, and the Best Bang for Your Buck (You're Not Training for the Tour de France)

VO2 max — your body's maximum capacity to take in and use oxygen during exercise — gets talked about constantly in endurance and elite sport circles. What gets missed is that it might be one of the single most important numbers for how long, and how well, you live. And improving it doesn't require training like a professional cyclist.