American College of Cardiology Mar 19 2026 People who regularly exercised early in the morning were significantly less likely to have coronary artery disease, high blood pressure, Type 2 diabetes or obesity compared with people who exercised later in the day, according to a study being presented at the American College of Cardiology's Annual Scientific Session (ACC.26). The research is based on health records and Fitbit-derived heart rate data from over 14,000 people. Although it is unclear