The beep test, also known as the shuttle run test or multi-stage fitness test, is a physical fitness assessment used to measure a person's aerobic capacity and endurance. Participants run back and forth between two markers set 20 meters apart, timing their runs to a series of beeps that gradually increase in frequency. The test continues until the participant can no longer keep up with the beeps. The beep test is commonly used in schools, sports teams, and fitness assessments to evaluate cardiovascular fitness. It provides a simple and effective way to gauge an individual's fitness level and track improvements over time.