If you’re referring to the claim that a cardiologist has identified one exercise that prevents heart attacks, the evidence is more nuanced: there isn’t a single exercise proven to prevent heart attacks.
Brisk walking is one of the simplest and most accessible choices. The American Heart Association recommends at least 150 minutes of moderate-intensity aerobic activity per week, such as brisk walking, spread throughout the week. It also recommends muscle-strengthening activity at least twice weekly. Regular physical activity can reduce cardiovascular risk and help control blood pressure, cholesterol, diabetes, and weight. www.heart.org+1
A practical starting point is 10–15 minutes of walking at a comfortable pace, gradually building toward about 30 minutes on most days. Even shorter periods of activity count. www.heart.org+1
If someone already has heart disease, has had a heart attack, or develops chest pain, unusual shortness of breath, dizziness, or fainting during exercise, they should get medical advice about an appropriate exercise program rather than suddenly increasing intensity. www.heart.org
