Which test is used for cardiorespiratory fitness

The Harvard Step Test is a widely used method to measure cardiorespiratory fitness and endurance. It involves stepping up and down on a platform of fixed height at a set pace for a specified duration; usually five minutes. After the exercise; heart rate is measured during recovery; and fitness levels are calculated. The test is simple; requires minimal equipment; and gives an indication of how efficiently the heart and lungs work during physical exertion.