The Bleep Test, also known as the, Multistage Fitness Test, Beep Test, Pacer Test, or 20m Shuttle Run Test, is used by sports coaches and trainers to estimate a participant's VO2 max (maximum oxygen uptake). The test is especially useful for players of sports like cross country, football, hockey, rugby, cricket, netball, soccer or tennis and is employed by many international sporting teams as an accurate test of Cardiovascular fitness, one of the all-important "Components of Fitness".

The Bleep Test involves running continuously between two points that are 20m apart. These runs are synchronized. Bleeps are played at set intervals. As the test proceeds, the interval between each successive bleep reduces, forcing the participant to increase velocity over the course of the test, until it is impossible to keep in sync with the recording.

The recording is structured into 21 'levels', each of which lasts around 62 seconds. The interval of bleeps is calculated, at a running speed of 8.5km/h, increasing by 0.5km/h with each level. The progression from one level to the next is signalled by rapid bleeps. The highest level attained before failing to keep up with the bleeps is recorded as the score for that test.