This study will enroll Black Americans with metabolic syndrome who have a sibling with premature CAD. Participants will be randomly assigned (by individual) to either a community-based exercise program (C-FIT) or a self-help home-based exercise program (HOME). Participants in the C-FIT group will do 1 hour of exercise two to three times each week in a community setting and will be supervised by a personal coach or trainer for 1 year. Participants in the SELF group will undergo a fitness evaluation and will be instructed on how to exercise on their own. They also will be expected to do 1 hour of exercise two to three times each week for 1 year. Study visits will occur at baseline, Month 6, and Years 1 and 2. At all study visits, participants will undergo the following: a medical history review; physical examination; blood pressure measurements; blood collection; body measurements, including height, weight, and waist circumference; a treadmill stress test; a strength test; a dual-energy x-ray absorptiometry (DEXA) scan to measure body fat; an echocardiogram to examine the heart; a flow-mediated vasodilatation test for brachial reactivity to measure vascular function; and questionnaires on diet, exercise habits, and self-efficacy.