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Exercise capacity, also known as cardiorespiratory endurance, is the total amount of physical effort that a person can bear without discomfort. A precise evaluation of workout capacity requires the patient to exert maximal physical effort for an adequate enough time to reflect the stable effect on the circulation. The exercise capacity evaluation is one of the key characteristics for assessing the condition of the patient. Lower exercise capacity is linked with various risks including hypertension, cardiovascular disease, heart failure, etc. Many studies have shown the correlation between lower exercise capacity and acute health conditions [4]. Furthermore, the response of the cardiovascular system during exercise can identify heart diseases as well as mortality [5, 6].

The exercise capacity of an individual can be assessed either by a face-to-face interview or by using laboratory methods based on the available facilities in the clinic. In the face-to-face interview with the patient, the cardiologist will ask about any unprecedented events experienced during various daily activities, such as walking, running, or exercise. On the other hand, the laboratory methods include multiple tests, such as an exercise stress test, a cardiopulmonary exercise test, a 6-minute walk test, a submaximal treadmill test, etc.