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Explain VO2 max as you would to a capable student, in 3-4 sentences.

VO2 max is the maximum amount of oxygen your body can use during intense exercise, measured in milliliters per kilogram of body weight per minute (ml/kg/min). It's essentially a measure of your aerobic fitness—the better your heart, lungs, and muscles work together to deliver and use oxygen, the higher your VO2 max. Think of it like your body's "engine size" for endurance activities: someone with a VO2 max of 55 ml/kg/min can process much more oxygen than someone at 35 ml/kg/min, making physical activities feel easier. You can improve your VO2 max through consistent cardiovascular training, though genetics also plays a significant role in your maximum potential.