It is commonly believed that minutes of exercise performed times per week is sufficient to improve health and reduce risk of illness.

It is commonly believed that 30-60 minutes of exercise performed 3-5 times per week is sufficient to improve health and reduce risk of illness.

Explanation:

According to the American Health Association report at least 30-60 minutes of the exercise is sufficient to improve health. It includes moderate physical activity like walking, jogging, aerobics.  

Further explanation:

Exercise regulates and improves the activity of the cardiovascular and muscular system. It can help to prevent the high blood pressure which can become the probable cause of hypertension. It can raise the concentration of HDL (high-density lipoproteins) or good cholesterol in the blood thus lowering the risk of heart diseases.  

Routine exercise helps in regulating and controlling the body weight thus reduces the risk of obesity.  It also manages stress which is also seen as a factor responsible for many health problems. It also strengthens the muscles and improves the mobility and flexibility of the body. The strengthening of muscles helps in performing daily activities easily and without any pain.  

It can be either aerobics which focuses on improving overall cardiovascular health or resistance training which focuses on improving fat to lean muscle ratio.  

Learn more:  

1. Regular physical activity : Ojeboy

2. Why is it important to exercise : User  

Keywords:

Exercise, hypertension, high density lipoprotein, mobility, flexibility, aerobics, resistance training

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i think the answer would be b.