Australian Rules Football (ARF) is an invasive field-based team sport that requires athletes to have the ability to perform repeat high-intensity, intermittent exercise including frequent accelerations, decelerations and change of direction (2, 8). Each team is made up of 22 players with only 18 on the field at any one time with 4 players on the interchange bench. A game is played between 2 teams over 4 quarters that last approximately 30 minutes. The main objective is to invade the opposition territory to score a goal. The evolution of ARF in terms of rule changes, team tactics and professionalism have influenced the physical demands of athletes in matches (12). For example the mean running velocity of a professional ARF athlete has increased from 6.8 ± 0.6 km/h in 2005 to 7.3 ± 0.7 km/h in 2008 (12). These observations have led to some debate in regards to the relevance of traditional fitness testing practices. For example, traditionally a 3km time trial (3KM TT) is used to measure athletes’ aerobic capacity. This measure of aerobic capacity is used to identify elite talent at the national draft camp held each year (3). However, in professional ARF, Mooney et al. (8) recently discovered a significant relationship between Yo-Yo Intermittent Recovery Level 2 (YYIR2) score and match performance.