Cardiac rehabilitation is a branch of rehabilitation medicine or physical therapy dealing with optimizing physical function in patients with cardiac disease or recent cardiac surgeries. cardiac rehab program may include exercises like cycling on a stationary bike, using a treadmill, low-impact aerobics, and swimming. Cardiac rehab may benefit you if you have: Cardiovascular disease Had a recent cardiac event, such as a heart attack Heart failure Had a cardiac procedure, such as angioplasty or heart surgery An arrhythmia (abnormal heart rhythm) or an implantable device (for example, pacemaker or defibrillator).