The Cooper 12-minute run test was developed by Dr. Kenneth Cooper in 1968 to easily measure aerobic fitness through estimating VO2 max. The test involves running as far as possible in 12 minutes, with walking allowed. The total distance run can then be used to estimate VO2 max via established equations. The Cooper test remains a basic fitness assessment tool that provides valid and reliable measurements of cardiovascular endurance when properly administered and scored. It allows for evaluating fitness over time or comparing results across multiple clients.