If you mean “What exercise is most strongly supported for reducing heart-attack risk?”, there isn’t a single exercise that cardiology guidelines designate as the number one.
The simple answer: brisk walking
Brisk walking is an excellent heart-health exercise because it provides moderate-intensity aerobic activity and is accessible to most people. The American Heart Association specifically lists brisk walking as an example of moderate-intensity activity and recommends at least 150 minutes per week, preferably spread across the week. www.heart.org+1
A practical target is:
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🚶 30 minutes of brisk walking, 5 days a week
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Add strength training 2 days a week
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If you’re currently inactive, start with shorter walks and gradually increase. www.heart.org+1
WHO similarly recommends 150–300 minutes of moderate aerobic activity per week for adults, noting that regular physical activity reduces cardiovascular-disease risk. Iris+1
If you have known heart disease, chest pain, significant shortness of breath, or have been sedentary for a long time, it’s sensible to discuss an exercise plan with a healthcare professional before suddenly doing vigorous exercise.
