This 4-month study will enroll African Americans with early stage hypertension. First, participants will take part in 3 days of baseline testing, including a medical history review, blood pressure and heart rate measurements, an echocardiogram to obtain images of the heart, and blood and urine collection. Over a 24-hour period, blood pressure and heart rate will be measured continuously and participants will wear a pedometer to keep track of the distance they walk. Participants will also complete a stress test; a treadmill exercise test; and questionnaires on mental health, physical health, and lifestyle.