VO2 Testing is a series of tests that allow a person or athlete to obtain an objective analysis on their ability to perform and sustain exercise. In other words how efficient is their heart in taking in oxygen, distributing it to muscles and organs while expelling the negative by products. This score is the best indicator of cardiovascular fitness and aerobic endurance.

VO2 Max is the maximum rate of oxygen consumption that the body can attain while the body is experiencing the most exercise possible. The person will breathe into an oxygen consumption analyzer while doing maximum exercise (different protocols include: treadmill, bike, and rowing machines). These protocols all require specific adjustments and increase in speed, incline, and intensity. During this exercise, a mask is worn to collect all the inhaled and expired air which is analyzed to determine concentration of oxygen. This then determines how much oxygen is used during the exercise test.