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Exercise physiologists may work in a clinical setting such as a hospital, rehabilitation center, or nursing home, where their client base may range from patients recovering from a recent heart attack to coping with chronic arthritis. Their first step in treatment is conducting a thorough patient assessment, which consists of a patient interview and fitness test. Exercise physiologists may have the patient walk on a treadmill while connected to an EKG machine. The EKG machine monitors the patient's heart rate and rhythm to ensure it remains within a safe range. Exercise physiologists may check the patient's blood pressure during the fitness tests to monitor his or her response to exercise. Patients may also be asked to wear a pulse oximeter on their finger; this device measures the concentration of oxygen in their blood. Other tools such as weights, bands, and balls may also be used to test for strength and flexibility.