The History
Jens Bangsbo grew up in Denmark and became one of the most influential exercise physiologists in football science. He spent the early part of his career at the University of Copenhagen, where he built a reputation for applying rigorous physiology to the demands of the game — not just in the laboratory but on the training pitch. His 1994 book Fitness Training in Football: A Scientific Approach became a foundational text for conditioning coaches across Europe.
Around 1990, Bangsbo recognised a gap in existing fitness testing. The Bleep Test and similar protocols measured continuous aerobic capacity well — but football, rugby, basketball and most team sports are not continuous. They are intermittent. Players sprint, slow down, recover, sprint again — hundreds of times across a match. A test that measured only sustained running missed the specific quality that determined whether a player could perform in the final minutes of a game.
The Yo-Yo Intermittent Recovery Test was his answer. Built on the same 20-metre shuttle structure as the Bleep Test, it added 10-second active recovery periods between each shuttle pair — periods in which the player jogs to a 5-metre cone and back before the next sprint begins. The name comes from the stop-start, back-and-forth pattern the test produces. The result is a test that stresses not just the aerobic system but the body's ability to repeatedly recover from high-intensity efforts — the exact quality that distinguishes a fit player from an exceptional one.
The Yo-Yo intermittent recovery test measures the ability to perform repeated intense exercise — a quality that is closely related to performance in many team sports.
— Jens Bangsbo, F. Marcello Iaia & Peter Krustrup, Sports Medicine, 2008The test was formally described in a landmark 2008 paper in Sports Medicine co-authored with Peter Krustrup and F. Marcello Iaia, which confirmed its reliability, physiological validity and correlation with VO₂ max across a wide range of sports and fitness levels. It has since been adopted by FIFA, by national football federations across the world, by cricket boards including the Board of Control for Cricket in India, by Australian Rules Football, and by top-level rugby and basketball programmes. The level a player achieves is taken seriously at the highest levels of professional sport.
How the Test Works
Protocol — Yo-Yo IR1
- Mark out a flat course with cones at 0m (start/finish line), 5m (recovery cone) and 20m (the turn line). Total space required: 25 metres
- Start the Yo-Yo IR1 audio track — this is specific to this test and different from the standard Bleep Test audio. The track controls the pace and must be used for valid results
- On the first beep, sprint from the 0m line to the 20m line. Touch or cross the 20m line before the second beep sounds
- Sprint back to the 0m start line before the third beep
- When back at the start, you have 10 seconds of active recovery — jog to the 5m recovery cone and back
- On the next beep, begin the next shuttle pair. The speed increases progressively every 1 to 2 levels
- The test ends when you fail to reach the 20m line before the beep twice in a row
- Record the total distance covered — this is your score. Distance is calculated from the level and number of shuttles completed
The audio track is not optional
The Yo-Yo IR1 test can only be conducted correctly with the official audio track. The speeds at each level are precisely calibrated — attempting to time the test manually will produce invalid results that cannot be compared to published normative data. The Yo-Yo IR1 audio track is widely available and can be found through sports science resources and official Bangsbo Sport materials.
Normative Data
The Yo-Yo test is primarily a sport-athlete test and lacks the large general population datasets that exist for simpler tests like the Bleep Test. The figures below are general guidelines drawn from sports science literature and should be used as a guide rather than absolute benchmarks. Performance varies significantly by sport, age and training background.
Men — IR1 Distance (metres)
| Rating | Distance | Context |
|---|---|---|
| Elite | Over 2400m | Top 5% — elite team sport athletes |
| Excellent | 1920–2400m | High-level club or semi-professional sport |
| Good | 1440–1919m | Regularly trained, strong aerobic base |
| Average | 960–1439m | Recreational level, moderate fitness |
| Below Average | Under 960m | Low aerobic fitness — consistent training needed |
Women — IR1 Distance (metres)
| Rating | Distance | Context |
|---|---|---|
| Elite | Over 1600m | Top 5% — elite team sport athletes |
| Excellent | 1120–1600m | High-level club or semi-professional sport |
| Good | 800–1119m | Regularly trained, strong aerobic base |
| Average | 480–799m | Recreational level, moderate fitness |
| Below Average | Under 480m | Low aerobic fitness — consistent training needed |
Coaching Points
The Bleep Test measures continuous aerobic capacity — the ability to sustain increasing speeds over time. The Yo-Yo IR1 measures intermittent recovery capacity — the ability to repeatedly perform high-intensity sprints with brief recovery periods. A person with excellent continuous endurance can score surprisingly low on the Yo-Yo if they lack the specific capacity to recover quickly between efforts. Both qualities matter; they are not the same quality.
Because the normative data for this test lacks the robust general population base of tests like the Harvard Step Test, the most useful comparison is always your own previous score. An improvement of 80 to 160m over an 8-week training block is meaningful progress regardless of where that puts you relative to published tables. Record the date, the conditions and the exact score every time you test.
Intermittent recovery capacity responds well to high-intensity interval training, repeated sprint work and specific Yo-Yo test preparation. Interval sessions at 85–95% maximum heart rate, shuttle run training and competitive team sport participation are the most direct routes to improvement. Building an aerobic base first — the kind measured by the Bleep Test — makes the high-intensity work more sustainable and produces better Yo-Yo scores over time.
