The multi-stage fitness test, also known as the beep test, is a physical fitness assessment designed to measure a person's aerobic capacity and endurance. Participants run back and forth between two markers set 20 meters apart, keeping pace with audio beeps that gradually increase in frequency. The test continues until the participant can no longer keep up with the beeps. This 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.