While regular exercise is widely recognized as a key component of heart health, medical experts say it cannot always prevent heart disease though it can significantly improve recovery outcomes.

That message is reflected in the experience of veteran competitive swimmer Duane Grassell, who remained physically active for decades but began experiencing chest discomfort in the pool three years ago. Medical evaluation revealed severe arterial blockages, and he required open-heart surgery.

Grassell underwent a quintuple bypass procedure performed by cardiothoracic surgeon Joseph Lahorra at the Cleveland Clinic.

According to Dr. Lahorra, lifestyle choices such as exercise and healthy eating are important but cannot always overcome powerful genetic and hereditary risk factors. Some individuals may develop heart disease despite maintaining good health habits.

However, physicians emphasize that regular physical activity remains critically important. Patients who maintain a baseline level of fitness prior to heart surgery often recover more quickly and regain function sooner than less active individuals.

Doctors note that exercise does not need to be intense to provide cardiovascular benefits. Moderate activities, including regular walking, can strengthen the heart and improve resilience during recovery.

For Grassell, temporarily giving up swimming during treatment proved emotionally challenging. After months of rehabilitation, he gradually returned to the pool. Now 68, two years after surgery, he swims at least 40 laps every other day and is preparing to compete in a state-level US Masters swimming championship. He also hopes to participate in a national competition at age 70.

Medical experts say his experience highlights an important takeaway: although exercise cannot guarantee protection against heart disease, it plays a crucial role in recovery, physical resilience, and long-term quality of life.