If you exercise regularly, if you exercise vigorously and want to know if you could do even better, you may want to know your VO2 max.
When you exercise, your oxygen consumption increases. It does so within limits which vary from person to person. Your VO2max (where V stands for Volume and O2 stands for oxygen) is your maximal ability to consume oxygen during exertion, measured in milliliters of oxygen per kg of body weight, per minute.
Oxygen is inhaled from the atmosphere by the lungs, where it diffuses into the blood stream, and then