Effects of Upper Extremity Low Volume HIIT in Heart Failure

This study tests a brief, low-volume high-intensity interval training (HIIT) program using the upper body (arms) to improve fitness and quality of life in people with heart failure who may have limitations with lower-body exercise. **You may be eligible if...** - You are over 18 years old - You have heart failure classified as New York Heart Association (NYHA) class I–III (mild to moderate symptoms) - Your condition has been clinically stable for at least 4 weeks **You may NOT be eligible if...** - You have had coronary bypass (CABG) surgery - You have unstable angina, severe irregular heartbeats, or uncontrolled high blood pressure - You have severe heart valve disease, hypertrophic cardiomyopathy, or a very low pumping function (EF below 40%) - You have had a recent pulmonary embolism, active heart inflammation (myocarditis/pericarditis), or fainting episodes - You have an orthopedic condition that interferes with upper-body exercise Talk to your doctor to see if this trial is right for you.