The incremental shuttle walk test (ISWT) is a field-based assessment of cardiorespiratory fitness and physical function.

The ISWT was originally designed to determine cardiorespiratory fitness and functional capacity and to predict mortality and morbidity in specific populations with chronic medical conditions and more recently in apparently healthy, relatively inactive populations. It is a safe, fairly simple test to learn and administer and should be considered a viable alternative to treadmill or bicycle ergometer testing for apparently healthy, nonathletic clients.