Exercise and Dietary Lifestyle Intervention on Reducing Atrial Fibrillation Burden, Cardiac and Body Fat Mass.

Who May Qualify: - Age 18-75 years - Body mass index (BMI) ≥27 kg/m² - Documented atrial fibrillation (paroxysmal or persistent) - Ability to participate in exercise training and follow study procedures - Access to a smartphone or device enabling rhythm monitoring - Provides written willing to sign a consent form Who Should NOT Join This Trial: - Permanent atrial fibrillation - Unstable angina pectoris or acute coronary syndrome within the past 3 months - Participation in other lifestyle or drug weight reduction trials - Significant left ventricular dysfunction (ejection fraction \<30%) - Severe valvular heart disease or planned cardiac surgery - Severe heart failure (NYHA class IV) or severe angina (CCS class IV) - Unstable coronary artery disease or recent myocardial infarction - Severe pulmonary disease limiting exercise capacity - Active malignancy - Autoimmune or systemic inflammatory diseases - Severe renal or hepatic failure - Memory disease or significant cognitive impairment - Unstable psychiatric condition - Recent joint or back surgery within the past 6 months - Continuing back or joint pain symptoms and inability to take part in individualized exercise training - Contraindications to exercise testing or training, including cardiac symptoms or cardiovascular symptoms, making exercise unsafe - Pregnancy or breastfeeding - Participation in another interventional study - Any condition judged by investigators to make participation unsafe or infeasible Always talk to your doctor about whether this trial is right for you.