Effectiveness of a Physical Exercise Prescription Program in Primary Care for Adults Aged 65 and Older: PREFIS-AP

Inclusion Criteria: * Age ≥ 65 years * Motivated to participate and able to provide informed consent * Able to attend baseline assessment and follow-up * Clinical stability allowing participation in exercise evaluation Exclusion Criteria: * Recent myocardial infarction * Unstable angina * Uncontrolled arrhythmias (symptomatic or hemodynamically compromising) * Syncope * Acute endocarditis, myocarditis, or pericarditis * Severe or symptomatic aortic stenosis * Uncontrolled heart failure * Recent pulmonary thromboembolism or pulmonary infarction * Lower-limb thrombosis * Severe aortic stenosis or suspected dissecting aortic aneurysm * Uncontrolled asthma * Pulmonary edema * Acute respiratory failure * Acute non-cardiopulmonary illness that impairs exercise capacity (e.g., infection, thyrotoxicosis, acute renal failure) * Mental disorder that prevents adequate cooperation.