The Harvard Step Test is a method used to assess cardio-respiratory fitness, which was developed by Brouha et al. (1943) in the Harvard Fatigue Laboratories during WWII. It is based on heart rate recovery following a given work load of 5 minutes or until exhaustion. There are many variations of stepping tests. Correlation of the Harvard Step Test to VO2max has been reported as between 0.6 to 0.8 in numerous studies. Test reliability depends upon how strict the test is conducted and the subject's level of motivation to perform the test.