Which of the following is NOT a risk factor for myocardial infarction?

Low physical activity is often associated with an increased risk of cardiovascular diseases, including myocardial infarction, so it is incorrectly identified as not being a risk factor. In contrast, a family history of coronary artery disease (CAD), especially if it occurs at a younger age, is a well-established risk factor because genetic predispositions can significantly increase the likelihood of early-onset heart disease. Hypertension is a major risk factor due to the additional strain it places on the heart and blood vessels, contributing to the thickening of arterial walls and increasing the risk for blockages. Obesity is also a major contributing factor, as excess body weight can lead to a multitude of issues such as high blood pressure, increased cholesterol levels, and diabetes, all of which are linked to a higher risk of myocardial infarction. Thus, low physical activity is indeed a risk factor but does not belong in a list of those that are NOT risk factors for myocardial infarction.