Regular brisk walking spurs weight loss, according to "Controlling Cholesterol." The book, by well-known heart surgeon Dr. Kenneth Cooper, defines brisk walking as 3.2 mph. "The Well Adult" book defines 3.75 mph as the brisk-walking speed, and the State of Wisconsin's "Calories Burned Per Hour"

Walking is one of the easiest cardio exercises you can do, and it’s an exercise that comes loaded with health and fitness benefits. As well as helping you maintain a healthy cardiovascular and respiratory system, walking keeps many important muscle groups working, key muscles that you use every day.