Secondary Endpoints: (1) change in daily energy expenditure (2) change in number of activity and sedentary bouts (3) change in sleep efficiency (4) change in weekly time of moderate/vigorous physical activity (5) change in quality of life (6) change in indicators of depression (7) change in medication adherence(8) change in HDL and LDL cholesterol (9) change in BMI and waist circumference (10) change in resting heart rate and blood pressure (11) change in exercise stress test performance (timeframe for all: baseline - 12 weeks)