Running, or swift walking, uses the major muscle groups, making it the most efficient form of cardiovascular exercise _______. It also lowers blood pressure and helps diabetics by improving glucose tolerance and reducing insulin resistance.

• A. It has been shown to have a positive effect on blood fats by reducing cholesterol levels
• B. During running, the speed at which the runner moves can be calculated by multiplying the steps per second by the stride length
• C. Running is a complex, coordinated process which involves the entire body
• D. Every human being runs differently, but certain general features of running motion are common